<?xml version="1.0" encoding="US-ASCII"?>
<!-- Generated by CompSci Transform (tm) - http://www.compsciresources.com -->
<!-- Created: Mon Nov 15 17:49:33 UTC 2021 -->
<linkbase xmlns="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns:xbrldt="http://xbrl.org/2005/xbrldt">
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_ConsolidatedBalanceSheet" roleURI="http://thcb.com/role/ConsolidatedBalanceSheet"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_ConsolidatedBalanceSheet_Parentheticals" roleURI="http://thcb.com/role/ConsolidatedBalanceSheet_Parentheticals"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_ConsolidatedIncomeStatement" roleURI="http://thcb.com/role/ConsolidatedIncomeStatement"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_ConsolidatedComprehensiveIncome" roleURI="http://thcb.com/role/ConsolidatedComprehensiveIncome"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_ShareholdersEquityType2or3" roleURI="http://thcb.com/role/ShareholdersEquityType2or3"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_ShareholdersEquityType2or3_Parentheticals" roleURI="http://thcb.com/role/ShareholdersEquityType2or3_Parentheticals"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_ConsolidatedCashFlow" roleURI="http://thcb.com/role/ConsolidatedCashFlow"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_DescriptionofOrganizationandBusinessOperations" roleURI="http://thcb.com/role/DescriptionofOrganizationandBusinessOperations"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_SignificantAccountingPolicies" roleURI="http://thcb.com/role/SignificantAccountingPolicies"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_ReverseRecapitalization" roleURI="http://thcb.com/role/ReverseRecapitalization"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_AccountsReceivable" roleURI="http://thcb.com/role/AccountsReceivable"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_InventoriesNet" roleURI="http://thcb.com/role/InventoriesNet"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_PrepaidExpensesandOtherCurrentAssets" roleURI="http://thcb.com/role/PrepaidExpensesandOtherCurrentAssets"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_AccruedExpensesandOtherCurrentLiabilities" roleURI="http://thcb.com/role/AccruedExpensesandOtherCurrentLiabilities"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_ProductWarranty" roleURI="http://thcb.com/role/ProductWarranty"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_BankBorrowings" roleURI="http://thcb.com/role/BankBorrowings"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_OtherNonCurrentLiabilities" roleURI="http://thcb.com/role/OtherNonCurrentLiabilities"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_BondsPayable" roleURI="http://thcb.com/role/BondsPayable"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_Warrants" roleURI="http://thcb.com/role/Warrants"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_FairValueMeasurement" roleURI="http://thcb.com/role/FairValueMeasurement"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_NoncontrollingInterests" roleURI="http://thcb.com/role/NoncontrollingInterests"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_CommonStock" roleURI="http://thcb.com/role/CommonStock"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_PreferredShares" roleURI="http://thcb.com/role/PreferredShares"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_Sharebasedpayment" roleURI="http://thcb.com/role/Sharebasedpayment"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_MainlandChinaContributionPlan" roleURI="http://thcb.com/role/MainlandChinaContributionPlan"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_RelatedPartyBalancesandTransactions" roleURI="http://thcb.com/role/RelatedPartyBalancesandTransactions"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_NetLossPerShare" roleURI="http://thcb.com/role/NetLossPerShare"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_CommitmentsandContingencies" roleURI="http://thcb.com/role/CommitmentsandContingencies"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_SubsequentEvents" roleURI="http://thcb.com/role/SubsequentEvents"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_AccountingPoliciesByPolicy" roleURI="http://thcb.com/role/AccountingPoliciesByPolicy"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_ReverseRecapitalizationTables" roleURI="http://thcb.com/role/ReverseRecapitalizationTables"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_AccountsReceivableTables" roleURI="http://thcb.com/role/AccountsReceivableTables"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_InventoriesNetTables" roleURI="http://thcb.com/role/InventoriesNetTables"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_PrepaidExpensesandOtherCurrentAssetsTables" roleURI="http://thcb.com/role/PrepaidExpensesandOtherCurrentAssetsTables"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_AccruedExpensesandOtherCurrentLiabilitiesTables" roleURI="http://thcb.com/role/AccruedExpensesandOtherCurrentLiabilitiesTables"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_ProductWarrantyTables" roleURI="http://thcb.com/role/ProductWarrantyTables"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_BankBorrowingsTables" roleURI="http://thcb.com/role/BankBorrowingsTables"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_OtherNonCurrentLiabilitiesTables" roleURI="http://thcb.com/role/OtherNonCurrentLiabilitiesTables"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_BondsPayableTables" roleURI="http://thcb.com/role/BondsPayableTables"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_WarrantsTables" roleURI="http://thcb.com/role/WarrantsTables"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_FairValueMeasurementTables" roleURI="http://thcb.com/role/FairValueMeasurementTables"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_PreferredSharesTables" roleURI="http://thcb.com/role/PreferredSharesTables"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_SharebasedpaymentTables" roleURI="http://thcb.com/role/SharebasedpaymentTables"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_RelatedPartyBalancesandTransactionsTables" roleURI="http://thcb.com/role/RelatedPartyBalancesandTransactionsTables"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_NetLossPerShareTables" roleURI="http://thcb.com/role/NetLossPerShareTables"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_CommitmentsandContingenciesTables" roleURI="http://thcb.com/role/CommitmentsandContingenciesTables"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_ScheduleofbusinesscombinationtheownershipinterestsofthecompanysstockholdersTable" roleURI="http://thcb.com/role/ScheduleofbusinesscombinationtheownershipinterestsofthecompanysstockholdersTable"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_ScheduleofaccountsreceivableTable" roleURI="http://thcb.com/role/ScheduleofaccountsreceivableTable"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_ScheduleofallowancefordoubtfulaccountsTable" roleURI="http://thcb.com/role/ScheduleofallowancefordoubtfulaccountsTable"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_ScheduleofInventoriesTable" roleURI="http://thcb.com/role/ScheduleofInventoriesTable"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_ScheduleofreceivablesrepresentedtheamountavailableforfuturedeductionagainstVATpayableTable" roleURI="http://thcb.com/role/ScheduleofreceivablesrepresentedtheamountavailableforfuturedeductionagainstVATpayableTable"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_ScheduleofaccruedexpensesandothercurrentliabilitiesTable" roleURI="http://thcb.com/role/ScheduleofaccruedexpensesandothercurrentliabilitiesTable"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_ScheduleofmovementofproductwarrantyTable" roleURI="http://thcb.com/role/ScheduleofmovementofproductwarrantyTable"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_ScheduleofwarrantycostTable" roleURI="http://thcb.com/role/ScheduleofwarrantycostTable"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_ScheduleofbankborrowingsTable" roleURI="http://thcb.com/role/ScheduleofbankborrowingsTable"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_ScheduleofbankingfacilitiesandaggregatecarryingamountTable" roleURI="http://thcb.com/role/ScheduleofbankingfacilitiesandaggregatecarryingamountTable"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_ScheduleofotherNonCurrentLiabilitiesTable" roleURI="http://thcb.com/role/ScheduleofotherNonCurrentLiabilitiesTable"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_ScheduleofbondspayableTable" roleURI="http://thcb.com/role/ScheduleofbondspayableTable"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_ScheduleofrepaymentsandinterestsTable" roleURI="http://thcb.com/role/ScheduleofrepaymentsandinterestsTable"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_ScheduleofundertheBinomialLatticeModelBLMthatassumesoptimalexerciseoftheCompanysredemptionoptionTable" roleURI="http://thcb.com/role/ScheduleofundertheBinomialLatticeModelBLMthatassumesoptimalexerciseoftheCompanysredemptionoptionTable"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_ScheduleoffairvaluemeasurementsofgroupsassetsandliabilitiesofrecurringbasisTable" roleURI="http://thcb.com/role/ScheduleoffairvaluemeasurementsofgroupsassetsandliabilitiesofrecurringbasisTable"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_ScheduleofreconciliationofthebeginningandendingbalancesforassetsandliabilitiesmeasuredatfairvalueonarecurringbasisTable" roleURI="http://thcb.com/role/ScheduleofreconciliationofthebeginningandendingbalancesforassetsandliabilitiesmeasuredatfairvalueonarecurringbasisTable"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_ScheduleofreconciliationofthebeginningandendingbalancesforLevel3warrantliabilityTable" roleURI="http://thcb.com/role/ScheduleofreconciliationofthebeginningandendingbalancesforLevel3warrantliabilityTable"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_ScheduleofpreferredsharesissuedandoutstandingTable" roleURI="http://thcb.com/role/ScheduleofpreferredsharesissuedandoutstandingTable"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_ScheduleofbalanceofSeriesPreferredandredeemablenoncontrollinginterestsTable" roleURI="http://thcb.com/role/ScheduleofbalanceofSeriesPreferredandredeemablenoncontrollinginterestsTable"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_ScheduleofstockoptionactivityplanTable" roleURI="http://thcb.com/role/ScheduleofstockoptionactivityplanTable"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_ScheduleofeffectivetimefairvalueofthestockoptionswasdeterminedusingtheBLMTable" roleURI="http://thcb.com/role/ScheduleofeffectivetimefairvalueofthestockoptionswasdeterminedusingtheBLMTable"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_SchedulenonvestedsharesactivityTable" roleURI="http://thcb.com/role/SchedulenonvestedsharesactivityTable"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_ScheduleofclassificationofstockbasedcompensationTable" roleURI="http://thcb.com/role/ScheduleofclassificationofstockbasedcompensationTable"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_ScheduleofrelationshipwiththegroupTable" roleURI="http://thcb.com/role/ScheduleofrelationshipwiththegroupTable"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_ScheduleofrelatedpartytransactionsTable" roleURI="http://thcb.com/role/ScheduleofrelatedpartytransactionsTable"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_ScheduleofcomputationofbasicanddilutednetlosspershareTable" roleURI="http://thcb.com/role/ScheduleofcomputationofbasicanddilutednetlosspershareTable"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_ScheduleofsharesoutstandingwereexcludedfromthecalculationofdilutednetlossperordinaryshareTable" roleURI="http://thcb.com/role/ScheduleofsharesoutstandingwereexcludedfromthecalculationofdilutednetlossperordinaryshareTable"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_ScheduleoffutureminimumpaymentsunderleasecommitmentsTable" roleURI="http://thcb.com/role/ScheduleoffutureminimumpaymentsunderleasecommitmentsTable"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_SignificantAccountingPoliciesDetails" roleURI="http://thcb.com/role/SignificantAccountingPoliciesDetails"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_ReverseRecapitalizationDetails" roleURI="http://thcb.com/role/ReverseRecapitalizationDetails"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_InventoriesNetDetails" roleURI="http://thcb.com/role/InventoriesNetDetails"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_ProductWarrantyDetails" roleURI="http://thcb.com/role/ProductWarrantyDetails"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_BankBorrowingsDetails" roleURI="http://thcb.com/role/BankBorrowingsDetails"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_BondsPayableDetails" roleURI="http://thcb.com/role/BondsPayableDetails"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_WarrantsDetails" roleURI="http://thcb.com/role/WarrantsDetails"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_NoncontrollingInterestsDetails" roleURI="http://thcb.com/role/NoncontrollingInterestsDetails"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_CommonStockDetails" roleURI="http://thcb.com/role/CommonStockDetails"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_PreferredSharesDetails" roleURI="http://thcb.com/role/PreferredSharesDetails"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_SharebasedpaymentDetails" roleURI="http://thcb.com/role/SharebasedpaymentDetails"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_MainlandChinaContributionPlanDetails" roleURI="http://thcb.com/role/MainlandChinaContributionPlanDetails"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_RelatedPartyBalancesandTransactionsDetails" roleURI="http://thcb.com/role/RelatedPartyBalancesandTransactionsDetails"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_CommitmentsandContingenciesDetails" roleURI="http://thcb.com/role/CommitmentsandContingenciesDetails"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#thcb_r_SubsequentEventsDetails" roleURI="http://thcb.com/role/SubsequentEventsDetails"/>
  <roleRef xlink:type="simple" xlink:href="thcb-20210930.xsd#DocumentAndEntityInformation" roleURI="http://thcb.com/role/DocumentAndEntityInformation"/>
  <arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default"/>
  <arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain"/>
  <arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension"/>
  <arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member"/>
  <arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" arcroleURI="http://xbrl.org/int/dim/arcrole/all"/>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/ConsolidatedBalanceSheet">
    <loc xlink:type="locator" xlink:label="us-gaap_StatementOfFinancialPositionAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementOfFinancialPositionAbstract"/>
    <loc xlink:type="locator" xlink:label="us-gaap_AssetsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsAbstract"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementOfFinancialPositionAbstract" xlink:to="us-gaap_AssetsAbstract" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_AssetsCurrentAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsCurrentAbstract"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AssetsAbstract" xlink:to="us-gaap_AssetsCurrentAbstract" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AssetsCurrentAbstract" xlink:to="us-gaap_CashAndCashEquivalentsAtCarryingValue" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RestrictedCashCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedCashCurrent"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AssetsCurrentAbstract" xlink:to="us-gaap_RestrictedCashCurrent" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_AccountsAndOtherReceivablesNetCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountsAndOtherReceivablesNetCurrent"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AssetsCurrentAbstract" xlink:to="us-gaap_AccountsAndOtherReceivablesNetCurrent" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ReceivablesNetCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ReceivablesNetCurrent"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AssetsCurrentAbstract" xlink:to="us-gaap_ReceivablesNetCurrent" order="3" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InventoryNet" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InventoryNet"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AssetsCurrentAbstract" xlink:to="us-gaap_InventoryNet" order="4" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_PrepaidExpenseAndOtherAssetsCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AssetsCurrentAbstract" xlink:to="us-gaap_PrepaidExpenseAndOtherAssetsCurrent" order="5" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_AmountDueFromRelatedParties" xlink:href="thcb-20210930.xsd#thcb_AmountDueFromRelatedParties"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AssetsCurrentAbstract" xlink:to="thcb_AmountDueFromRelatedParties" order="6" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_AssetsCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsCurrent"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AssetsCurrentAbstract" xlink:to="us-gaap_AssetsCurrent" order="7" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_PropertyPlantAndEquipmentNet" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AssetsCurrentAbstract" xlink:to="us-gaap_PropertyPlantAndEquipmentNet" order="8" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_OperatingLeaseRightOfUseAsset" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AssetsCurrentAbstract" xlink:to="us-gaap_OperatingLeaseRightOfUseAsset" order="9" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AssetsCurrentAbstract" xlink:to="us-gaap_IntangibleAssetsNetExcludingGoodwill" order="10" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_OtherAssetsNoncurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AssetsCurrentAbstract" xlink:to="us-gaap_OtherAssetsNoncurrent" order="11" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_Assets" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Assets"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AssetsAbstract" xlink:to="us-gaap_Assets" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_LiabilitiesCurrentAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementOfFinancialPositionAbstract" xlink:to="us-gaap_LiabilitiesCurrentAbstract" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_AccountsPayableCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountsPayableCurrent"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesCurrentAbstract" xlink:to="us-gaap_AccountsPayableCurrent" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_CustomerAdvancesCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CustomerAdvancesCurrent"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesCurrentAbstract" xlink:to="us-gaap_CustomerAdvancesCurrent" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_AccountsPayableAndOtherAccruedLiabilitiesCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountsPayableAndOtherAccruedLiabilitiesCurrent"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesCurrentAbstract" xlink:to="us-gaap_AccountsPayableAndOtherAccruedLiabilitiesCurrent" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_TaxesPayableCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TaxesPayableCurrent"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesCurrentAbstract" xlink:to="us-gaap_TaxesPayableCurrent" order="3" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ShortTermBorrowings" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShortTermBorrowings"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesCurrentAbstract" xlink:to="us-gaap_ShortTermBorrowings" order="4" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_NotesPayableCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NotesPayableCurrent"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesCurrentAbstract" xlink:to="us-gaap_NotesPayableCurrent" order="5" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_BondsPayableCurrent" xlink:href="thcb-20210930.xsd#thcb_BondsPayableCurrent"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesCurrentAbstract" xlink:to="thcb_BondsPayableCurrent" order="6" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_LiabilitiesCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesCurrent"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesCurrentAbstract" xlink:to="us-gaap_LiabilitiesCurrent" order="7" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_SeriesB2ConvertiblePreferredShares" xlink:href="thcb-20210930.xsd#thcb_SeriesB2ConvertiblePreferredShares"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesCurrentAbstract" xlink:to="thcb_SeriesB2ConvertiblePreferredShares" order="8" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_LongtermBondsPayable" xlink:href="thcb-20210930.xsd#thcb_LongtermBondsPayable"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesCurrentAbstract" xlink:to="thcb_LongtermBondsPayable" order="9" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_DerivativeLiabilities" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeLiabilities"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesCurrentAbstract" xlink:to="us-gaap_DerivativeLiabilities" order="10" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesCurrentAbstract" xlink:to="us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent" order="11" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_OtherLiabilitiesNoncurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesCurrentAbstract" xlink:to="us-gaap_OtherLiabilitiesNoncurrent" order="12" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_Liabilities" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Liabilities"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementOfFinancialPositionAbstract" xlink:to="us-gaap_Liabilities" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_TemporaryEquityAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TemporaryEquityAbstract"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementOfFinancialPositionAbstract" xlink:to="us-gaap_TemporaryEquityAbstract" order="3" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_SeriesC1ConvertibleRedeemablePreferredShares" xlink:href="thcb-20210930.xsd#thcb_SeriesC1ConvertibleRedeemablePreferredShares"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_TemporaryEquityAbstract" xlink:to="thcb_SeriesC1ConvertibleRedeemablePreferredShares" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_SeriesC2ConvertibleRedeemablePreferredShares" xlink:href="thcb-20210930.xsd#thcb_SeriesC2ConvertibleRedeemablePreferredShares"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_TemporaryEquityAbstract" xlink:to="thcb_SeriesC2ConvertibleRedeemablePreferredShares" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_SeriesD1ConvertibleRedeemablePreferredShares" xlink:href="thcb-20210930.xsd#thcb_SeriesD1ConvertibleRedeemablePreferredShares"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_TemporaryEquityAbstract" xlink:to="thcb_SeriesD1ConvertibleRedeemablePreferredShares" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_TemporaryEquityAbstract" xlink:to="us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount" order="3" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_TotalMezzanineEquity" xlink:href="thcb-20210930.xsd#thcb_TotalMezzanineEquity"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_TemporaryEquityAbstract" xlink:to="thcb_TotalMezzanineEquity" order="4" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_CommitmentsAndContingencies" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommitmentsAndContingencies"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_TemporaryEquityAbstract" xlink:to="us-gaap_CommitmentsAndContingencies" order="5" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_StockholdersEquityAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquityAbstract"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementOfFinancialPositionAbstract" xlink:to="us-gaap_StockholdersEquityAbstract" order="4" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_CommonStockValue" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockValue"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StockholdersEquityAbstract" xlink:to="us-gaap_CommonStockValue" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_AdditionalPaidInCapital" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdditionalPaidInCapital"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StockholdersEquityAbstract" xlink:to="us-gaap_AdditionalPaidInCapital" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StockholdersEquityAbstract" xlink:to="us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StockholdersEquityAbstract" xlink:to="us-gaap_RetainedEarningsAccumulatedDeficit" order="3" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StockholdersEquityAbstract" xlink:to="us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" order="4" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementOfFinancialPositionAbstract" xlink:to="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" order="5" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementOfFinancialPositionAbstract" xlink:to="us-gaap_LiabilitiesAndStockholdersEquity" order="6" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/ConsolidatedBalanceSheet_Parentheticals">
    <loc xlink:type="locator" xlink:label="us-gaap_StatementLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems"/>
    <loc xlink:type="locator" xlink:label="us-gaap_StatementTable" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StatementTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_StatementClassOfStockAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementClassOfStockAxis"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_StatementTable" xlink:to="us-gaap_StatementClassOfStockAxis" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ClassOfStockDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_StatementClassOfStockAxis" xlink:to="us-gaap_ClassOfStockDomain" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ClassOfStockDomain_0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_StatementClassOfStockAxis" xlink:to="us-gaap_ClassOfStockDomain_0" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_SeriesC1ConvertibleRedeemablePreferredSharesMember" xlink:href="thcb-20210930.xsd#thcb_SeriesC1ConvertibleRedeemablePreferredSharesMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="thcb_SeriesC1ConvertibleRedeemablePreferredSharesMember" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_SeriesC2ConvertibleRedeemablePreferredShareMember" xlink:href="thcb-20210930.xsd#thcb_SeriesC2ConvertibleRedeemablePreferredShareMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="thcb_SeriesC2ConvertibleRedeemablePreferredShareMember" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_SeriesD1ConvertibleRedeemablePreferredSharesMember" xlink:href="thcb-20210930.xsd#thcb_SeriesD1ConvertibleRedeemablePreferredSharesMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="thcb_SeriesD1ConvertibleRedeemablePreferredSharesMember" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_RedeemablePreferredSharesParValue" xlink:href="thcb-20210930.xsd#thcb_RedeemablePreferredSharesParValue"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="thcb_RedeemablePreferredSharesParValue" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_RedeemablePreferredSharesAuthorized" xlink:href="thcb-20210930.xsd#thcb_RedeemablePreferredSharesAuthorized"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="thcb_RedeemablePreferredSharesAuthorized" order="3" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_RedeemablePreferredSharesIssued" xlink:href="thcb-20210930.xsd#thcb_RedeemablePreferredSharesIssued"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="thcb_RedeemablePreferredSharesIssued" order="4" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_RedeemablePreferredSharesOutstanding" xlink:href="thcb-20210930.xsd#thcb_RedeemablePreferredSharesOutstanding"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="thcb_RedeemablePreferredSharesOutstanding" order="5" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_CommonStockParOrStatedValuePerShare" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_CommonStockParOrStatedValuePerShare" order="6" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_CommonStockSharesAuthorized" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockSharesAuthorized"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_CommonStockSharesAuthorized" order="7" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_CommonStockSharesIssued" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockSharesIssued"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_CommonStockSharesIssued" order="8" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_CommonStockSharesOutstanding" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_CommonStockSharesOutstanding" order="9" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/ConsolidatedIncomeStatement">
    <loc xlink:type="locator" xlink:label="us-gaap_IncomeStatementAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementAbstract"/>
    <loc xlink:type="locator" xlink:label="us-gaap_Revenues" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Revenues"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IncomeStatementAbstract" xlink:to="us-gaap_Revenues" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_CostOfRevenue" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CostOfRevenue"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IncomeStatementAbstract" xlink:to="us-gaap_CostOfRevenue" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_GrossProfit" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GrossProfit"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IncomeStatementAbstract" xlink:to="us-gaap_GrossProfit" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_OperatingExpensesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingExpensesAbstract"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IncomeStatementAbstract" xlink:to="us-gaap_OperatingExpensesAbstract" order="3" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_GeneralAndAdministrativeExpense" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GeneralAndAdministrativeExpense"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OperatingExpensesAbstract" xlink:to="us-gaap_GeneralAndAdministrativeExpense" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ResearchAndDevelopmentExpense" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ResearchAndDevelopmentExpense"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OperatingExpensesAbstract" xlink:to="us-gaap_ResearchAndDevelopmentExpense" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_SellingAndMarketingExpense" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SellingAndMarketingExpense"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OperatingExpensesAbstract" xlink:to="us-gaap_SellingAndMarketingExpense" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_OperatingExpenses" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingExpenses"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IncomeStatementAbstract" xlink:to="us-gaap_OperatingExpenses" order="4" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_SubsidyIncome" xlink:href="thcb-20210930.xsd#thcb_SubsidyIncome"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OperatingExpenses" xlink:to="thcb_SubsidyIncome" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_OperatingIncomeLoss" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingIncomeLoss"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IncomeStatementAbstract" xlink:to="us-gaap_OperatingIncomeLoss" order="5" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_OtherIncomeAndExpensesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherIncomeAndExpensesAbstract"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IncomeStatementAbstract" xlink:to="us-gaap_OtherIncomeAndExpensesAbstract" order="6" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_InterestIncome" xlink:href="thcb-20210930.xsd#thcb_InterestIncome"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OtherIncomeAndExpensesAbstract" xlink:to="thcb_InterestIncome" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InterestExpense" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestExpense"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OtherIncomeAndExpensesAbstract" xlink:to="us-gaap_InterestExpense" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_GainlossOnChangesInFairValueOfConvertibleNotes" xlink:href="thcb-20210930.xsd#thcb_GainlossOnChangesInFairValueOfConvertibleNotes"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OtherIncomeAndExpensesAbstract" xlink:to="thcb_GainlossOnChangesInFairValueOfConvertibleNotes" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_GainOnChangeInFairValueOfWarrantLiability" xlink:href="thcb-20210930.xsd#thcb_GainOnChangeInFairValueOfWarrantLiability"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OtherIncomeAndExpensesAbstract" xlink:to="thcb_GainOnChangeInFairValueOfWarrantLiability" order="3" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_NonoperatingIncomeExpense" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OtherIncomeAndExpensesAbstract" xlink:to="us-gaap_NonoperatingIncomeExpense" order="4" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OtherIncomeAndExpensesAbstract" xlink:to="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" order="5" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_IncomeTaxExpenseBenefit" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OtherIncomeAndExpensesAbstract" xlink:to="us-gaap_IncomeTaxExpenseBenefit" order="6" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ProfitLoss" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProfitLoss"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IncomeStatementAbstract" xlink:to="us-gaap_ProfitLoss" order="7" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_LessAccretionOfSeriesC1Preferred" xlink:href="thcb-20210930.xsd#thcb_LessAccretionOfSeriesC1Preferred"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ProfitLoss" xlink:to="thcb_LessAccretionOfSeriesC1Preferred" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_LessAccretionOfSeriesC2PreferredStock" xlink:href="thcb-20210930.xsd#thcb_LessAccretionOfSeriesC2PreferredStock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ProfitLoss" xlink:to="thcb_LessAccretionOfSeriesC2PreferredStock" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_LessAccretionOfSeriesD1Preferred" xlink:href="thcb-20210930.xsd#thcb_LessAccretionOfSeriesD1Preferred"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ProfitLoss" xlink:to="thcb_LessAccretionOfSeriesD1Preferred" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_LessAccretionForNoncontrollingInterests" xlink:href="thcb-20210930.xsd#thcb_LessAccretionForNoncontrollingInterests"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ProfitLoss" xlink:to="thcb_LessAccretionForNoncontrollingInterests" order="3" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_NetLossAttributableToOrdinaryShareholdersOfMicrovastInc" xlink:href="thcb-20210930.xsd#thcb_NetLossAttributableToOrdinaryShareholdersOfMicrovastInc"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IncomeStatementAbstract" xlink:to="thcb_NetLossAttributableToOrdinaryShareholdersOfMicrovastInc" order="8" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_NetLossPerShareAttributableToCommonStockShareholdersOfMicrovastHoldingsIncAbstract" xlink:href="thcb-20210930.xsd#thcb_NetLossPerShareAttributableToCommonStockShareholdersOfMicrovastHoldingsIncAbstract"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IncomeStatementAbstract" xlink:to="thcb_NetLossPerShareAttributableToCommonStockShareholdersOfMicrovastHoldingsIncAbstract" order="9" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_EarningsPerShareBasicAndDiluted" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EarningsPerShareBasicAndDiluted"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_NetLossPerShareAttributableToCommonStockShareholdersOfMicrovastHoldingsIncAbstract" xlink:to="us-gaap_EarningsPerShareBasicAndDiluted" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_NetLossPerShareAttributableToCommonStockShareholdersOfMicrovastHoldingsIncAbstract" xlink:to="us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted" order="1" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/ConsolidatedComprehensiveIncome">
    <loc xlink:type="locator" xlink:label="us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ProfitLoss" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProfitLoss"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract" xlink:to="us-gaap_ProfitLoss" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract" xlink:to="us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ComprehensiveIncomeNetOfTax" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract" xlink:to="us-gaap_ComprehensiveIncomeNetOfTax" order="2" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/ShareholdersEquityType2or3">
    <loc xlink:type="locator" xlink:label="us-gaap_StatementLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems"/>
    <loc xlink:type="locator" xlink:label="us-gaap_StatementTable" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StatementTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_StatementEquityComponentsAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_StatementTable" xlink:to="us-gaap_StatementEquityComponentsAxis" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_EquityComponentDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_StatementEquityComponentsAxis" xlink:to="us-gaap_EquityComponentDomain" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_EquityComponentDomain_0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_StatementEquityComponentsAxis" xlink:to="us-gaap_EquityComponentDomain_0" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_CommonStockMember" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityComponentDomain" xlink:to="us-gaap_CommonStockMember" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_AdditionalPaidInCapitalMember" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityComponentDomain" xlink:to="us-gaap_AdditionalPaidInCapitalMember" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RetainedEarningsMember" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetainedEarningsMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityComponentDomain" xlink:to="us-gaap_RetainedEarningsMember" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityComponentDomain" xlink:to="us-gaap_AccumulatedOtherComprehensiveIncomeMember" order="3" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_StatutoryReserveMember" xlink:href="thcb-20210930.xsd#thcb_StatutoryReserveMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityComponentDomain" xlink:to="thcb_StatutoryReserveMember" order="4" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_SharesOutstanding" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharesOutstanding"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_SharesOutstanding" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic" order="3" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_AccretionForSeriesC1Preferred" xlink:href="thcb-20210930.xsd#thcb_AccretionForSeriesC1Preferred"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="thcb_AccretionForSeriesC1Preferred" order="4" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_AccretionForSeriesC2Preferred" xlink:href="thcb-20210930.xsd#thcb_AccretionForSeriesC2Preferred"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="thcb_AccretionForSeriesC2Preferred" order="5" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_AccretionForSeriesD1Preferred" xlink:href="thcb-20210930.xsd#thcb_AccretionForSeriesD1Preferred"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="thcb_AccretionForSeriesD1Preferred" order="6" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_AccretionForSeriesDOnePreferred" xlink:href="thcb-20210930.xsd#thcb_AccretionForSeriesDOnePreferred"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="thcb_AccretionForSeriesDOnePreferred" order="7" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_AccretionForTheExitingNoncontrollingInterests" xlink:href="thcb-20210930.xsd#thcb_AccretionForTheExitingNoncontrollingInterests"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="thcb_AccretionForTheExitingNoncontrollingInterests" order="8" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_StockIssuedDuringPeriodValueOther" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueOther"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StockIssuedDuringPeriodValueOther" order="9" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_StockIssuedDuringPeriodSharesOther" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesOther"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StockIssuedDuringPeriodSharesOther" order="10" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation" order="11" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation" order="12" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_TemporaryEquityForeignCurrencyTranslationAdjustments" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TemporaryEquityForeignCurrencyTranslationAdjustments"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_TemporaryEquityForeignCurrencyTranslationAdjustments" order="13" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_AccretionForRedeemableNoncontrollingInterest" xlink:href="thcb-20210930.xsd#thcb_AccretionForRedeemableNoncontrollingInterest"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="thcb_AccretionForRedeemableNoncontrollingInterest" order="14" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/ShareholdersEquityType2or3_Parentheticals">
    <loc xlink:type="locator" xlink:label="us-gaap_StatementOfStockholdersEquityAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementOfStockholdersEquityAbstract"/>
    <loc xlink:type="locator" xlink:label="us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementOfStockholdersEquityAbstract" xlink:to="us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities" order="0" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/ConsolidatedCashFlow">
    <loc xlink:type="locator" xlink:label="us-gaap_StatementOfCashFlowsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementOfCashFlowsAbstract"/>
    <loc xlink:type="locator" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementOfCashFlowsAbstract" xlink:to="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_IncomeLossFromContinuingOperations" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeLossFromContinuingOperations"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_IncomeLossFromContinuingOperations" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementOfCashFlowsAbstract" xlink:to="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_LossGainOnDisposalOfPropertyPlantAndEquipment" xlink:href="thcb-20210930.xsd#thcb_LossGainOnDisposalOfPropertyPlantAndEquipment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="thcb_LossGainOnDisposalOfPropertyPlantAndEquipment" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_DepreciationNonproduction" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DepreciationNonproduction"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_DepreciationNonproduction" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_AmortizationOfLandUseRightAndIntangibleAssets" xlink:href="thcb-20210930.xsd#thcb_AmortizationOfLandUseRightAndIntangibleAssets"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="thcb_AmortizationOfLandUseRightAndIntangibleAssets" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensation" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensation"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_ShareBasedCompensation" order="3" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_FairValueAdjustmentOfWarrants" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueAdjustmentOfWarrants"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_FairValueAdjustmentOfWarrants" order="4" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_ChangesInFairValueOfConvertibleNotesDebt" xlink:href="thcb-20210930.xsd#thcb_ChangesInFairValueOfConvertibleNotesDebt"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="thcb_ChangesInFairValueOfConvertibleNotesDebt" order="5" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ProvisionForDoubtfulAccounts" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProvisionForDoubtfulAccounts"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_ProvisionForDoubtfulAccounts" order="6" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_ProvisionForObsoleteInventories" xlink:href="thcb-20210930.xsd#thcb_ProvisionForObsoleteInventories"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="thcb_ProvisionForObsoleteInventories" order="7" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_ImpairmentLossFromPropertyPlantAndEquipments" xlink:href="thcb-20210930.xsd#thcb_ImpairmentLossFromPropertyPlantAndEquipments"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="thcb_ImpairmentLossFromPropertyPlantAndEquipments" order="8" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ProductWarrantyExpense" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProductWarrantyExpense"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_ProductWarrantyExpense" order="9" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementOfCashFlowsAbstract" xlink:to="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_IncreaseDecreaseInNotesReceivables" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInNotesReceivables"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:to="us-gaap_IncreaseDecreaseInNotesReceivables" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:to="us-gaap_IncreaseDecreaseInAccountsReceivable" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_IncreaseDecreaseInInventories" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInInventories"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:to="us-gaap_IncreaseDecreaseInInventories" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:to="us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" order="3" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_IncreaseDecreaseInDueToOtherRelatedParties" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInDueToOtherRelatedParties"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:to="us-gaap_IncreaseDecreaseInDueToOtherRelatedParties" order="4" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_IncreaseDecreaseInOtherNoncurrentAssets" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInOtherNoncurrentAssets"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:to="us-gaap_IncreaseDecreaseInOtherNoncurrentAssets" order="5" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_IncreaseDecreaseInNotesPayable" xlink:href="thcb-20210930.xsd#thcb_IncreaseDecreaseInNotesPayable"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:to="thcb_IncreaseDecreaseInNotesPayable" order="6" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_IncreaseDecreaseInAccountsPayable" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayable"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:to="us-gaap_IncreaseDecreaseInAccountsPayable" order="7" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_IncreaseDecreaseInContractWithCustomerLiability" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInContractWithCustomerLiability"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:to="us-gaap_IncreaseDecreaseInContractWithCustomerLiability" order="8" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:to="us-gaap_IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities" order="9" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:to="us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities" order="10" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:to="us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable" order="11" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:to="us-gaap_NetCashProvidedByUsedInOperatingActivities" order="12" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementOfCashFlowsAbstract" xlink:to="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" order="3" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:to="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_ProceedsOnDisposalOfPropertyPlantAndEquipment" xlink:href="thcb-20210930.xsd#thcb_ProceedsOnDisposalOfPropertyPlantAndEquipment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:to="thcb_ProceedsOnDisposalOfPropertyPlantAndEquipment" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_PaymentsToAcquireInvestments" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsToAcquireInvestments"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:to="us-gaap_PaymentsToAcquireInvestments" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_ProceedsFromMaturityOfShorttermInvestments" xlink:href="thcb-20210930.xsd#thcb_ProceedsFromMaturityOfShorttermInvestments"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:to="thcb_ProceedsFromMaturityOfShorttermInvestments" order="3" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:to="us-gaap_NetCashProvidedByUsedInInvestingActivities" order="4" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementOfCashFlowsAbstract" xlink:to="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" order="4" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ProceedsFromBankDebt" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromBankDebt"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="us-gaap_ProceedsFromBankDebt" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RepaymentsOfBankDebt" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RepaymentsOfBankDebt"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="us-gaap_RepaymentsOfBankDebt" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_LoansBorrowingFromRelatedParties" xlink:href="thcb-20210930.xsd#thcb_LoansBorrowingFromRelatedParties"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="thcb_LoansBorrowingFromRelatedParties" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RepaymentsOfRelatedPartyDebt" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RepaymentsOfRelatedPartyDebt"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="us-gaap_RepaymentsOfRelatedPartyDebt" order="3" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_MergerAndPrivateInvestmentIPIPEFinancing" xlink:href="thcb-20210930.xsd#thcb_MergerAndPrivateInvestmentIPIPEFinancing"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="thcb_MergerAndPrivateInvestmentIPIPEFinancing" order="4" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_PaymentForTransactionFeeInConnectionWithTheMergerTransaction" xlink:href="thcb-20210930.xsd#thcb_PaymentForTransactionFeeInConnectionWithTheMergerTransaction"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="thcb_PaymentForTransactionFeeInConnectionWithTheMergerTransaction" order="5" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_RepurchaseSharesFromExitingNoncontrollingInterests" xlink:href="thcb-20210930.xsd#thcb_RepurchaseSharesFromExitingNoncontrollingInterests"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="thcb_RepurchaseSharesFromExitingNoncontrollingInterests" order="6" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_IssuanceOfConvertibleBonds" xlink:href="thcb-20210930.xsd#thcb_IssuanceOfConvertibleBonds"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="thcb_IssuanceOfConvertibleBonds" order="7" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="us-gaap_NetCashProvidedByUsedInFinancingActivities" order="8" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementOfCashFlowsAbstract" xlink:to="us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" order="5" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementOfCashFlowsAbstract" xlink:to="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" order="6" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:to="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_CashAndCashEquivalents" xlink:href="thcb-20210930.xsd#thcb_CashAndCashEquivalents"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementOfCashFlowsAbstract" xlink:to="thcb_CashAndCashEquivalents" order="7" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_RestrictedAtCash" xlink:href="thcb-20210930.xsd#thcb_RestrictedAtCash"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_CashAndCashEquivalents" xlink:to="thcb_RestrictedAtCash" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_TotalCashCashEquivalentsAndRestrictedCash" xlink:href="thcb-20210930.xsd#thcb_TotalCashCashEquivalentsAndRestrictedCash"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_CashAndCashEquivalents" xlink:to="thcb_TotalCashCashEquivalentsAndRestrictedCash" order="1" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/DescriptionofOrganizationandBusinessOperations">
    <loc xlink:type="locator" xlink:label="us-gaap_AccountingPoliciesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountingPoliciesAbstract"/>
    <loc xlink:type="locator" xlink:label="us-gaap_NatureOfOperations" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NatureOfOperations"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccountingPoliciesAbstract" xlink:to="us-gaap_NatureOfOperations" order="0" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/SignificantAccountingPolicies">
    <loc xlink:type="locator" xlink:label="us-gaap_AccountingPoliciesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountingPoliciesAbstract"/>
    <loc xlink:type="locator" xlink:label="us-gaap_SignificantAccountingPoliciesTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SignificantAccountingPoliciesTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccountingPoliciesAbstract" xlink:to="us-gaap_SignificantAccountingPoliciesTextBlock" order="0" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/ReverseRecapitalization">
    <loc xlink:type="locator" xlink:label="thcb_ReverseRecapitalizationAbstract" xlink:href="thcb-20210930.xsd#thcb_ReverseRecapitalizationAbstract"/>
    <loc xlink:type="locator" xlink:label="thcb_ReverseRecapitalizationTextBlock" xlink:href="thcb-20210930.xsd#thcb_ReverseRecapitalizationTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ReverseRecapitalizationAbstract" xlink:to="thcb_ReverseRecapitalizationTextBlock" order="0" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/AccountsReceivable">
    <loc xlink:type="locator" xlink:label="us-gaap_ReceivablesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ReceivablesAbstract"/>
    <loc xlink:type="locator" xlink:label="us-gaap_LoansNotesTradeAndOtherReceivablesDisclosureTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LoansNotesTradeAndOtherReceivablesDisclosureTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ReceivablesAbstract" xlink:to="us-gaap_LoansNotesTradeAndOtherReceivablesDisclosureTextBlock" order="0" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/InventoriesNet">
    <loc xlink:type="locator" xlink:label="us-gaap_InventoryDisclosureAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InventoryDisclosureAbstract"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InventoryDisclosureTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InventoryDisclosureTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InventoryDisclosureAbstract" xlink:to="us-gaap_InventoryDisclosureTextBlock" order="0" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/PrepaidExpensesandOtherCurrentAssets">
    <loc xlink:type="locator" xlink:label="thcb_PrepaidExpensesAndOtherCurrentAssetsAbstract" xlink:href="thcb-20210930.xsd#thcb_PrepaidExpensesAndOtherCurrentAssetsAbstract"/>
    <loc xlink:type="locator" xlink:label="thcb_PrepaidExpensesAndOtherCurrentAssetsTextBlock" xlink:href="thcb-20210930.xsd#thcb_PrepaidExpensesAndOtherCurrentAssetsTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_PrepaidExpensesAndOtherCurrentAssetsAbstract" xlink:to="thcb_PrepaidExpensesAndOtherCurrentAssetsTextBlock" order="0" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/AccruedExpensesandOtherCurrentLiabilities">
    <loc xlink:type="locator" xlink:label="us-gaap_AccruedLiabilitiesAndOtherLiabilitiesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccruedLiabilitiesAndOtherLiabilitiesAbstract"/>
    <loc xlink:type="locator" xlink:label="us-gaap_AccountsPayableAccruedLiabilitiesAndOtherLiabilitiesDisclosureCurrentTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountsPayableAccruedLiabilitiesAndOtherLiabilitiesDisclosureCurrentTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccruedLiabilitiesAndOtherLiabilitiesAbstract" xlink:to="us-gaap_AccountsPayableAccruedLiabilitiesAndOtherLiabilitiesDisclosureCurrentTextBlock" order="0" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/ProductWarranty">
    <loc xlink:type="locator" xlink:label="us-gaap_ProductWarrantiesDisclosuresAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProductWarrantiesDisclosuresAbstract"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ProductWarrantyDisclosureTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProductWarrantyDisclosureTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ProductWarrantiesDisclosuresAbstract" xlink:to="us-gaap_ProductWarrantyDisclosureTextBlock" order="0" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/BankBorrowings">
    <loc xlink:type="locator" xlink:label="thcb_BankBorrowingsAbstract" xlink:href="thcb-20210930.xsd#thcb_BankBorrowingsAbstract"/>
    <loc xlink:type="locator" xlink:label="thcb_BankBorrowingsTextBlock" xlink:href="thcb-20210930.xsd#thcb_BankBorrowingsTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_BankBorrowingsAbstract" xlink:to="thcb_BankBorrowingsTextBlock" order="0" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/OtherNonCurrentLiabilities">
    <loc xlink:type="locator" xlink:label="us-gaap_OtherLiabilitiesNoncurrentAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrentAbstract"/>
    <loc xlink:type="locator" xlink:label="us-gaap_OtherLiabilitiesDisclosureTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherLiabilitiesDisclosureTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OtherLiabilitiesNoncurrentAbstract" xlink:to="us-gaap_OtherLiabilitiesDisclosureTextBlock" order="0" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/BondsPayable">
    <loc xlink:type="locator" xlink:label="thcb_BondsPayableAbstract" xlink:href="thcb-20210930.xsd#thcb_BondsPayableAbstract"/>
    <loc xlink:type="locator" xlink:label="thcb_BondsPayableTextBlock" xlink:href="thcb-20210930.xsd#thcb_BondsPayableTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_BondsPayableAbstract" xlink:to="thcb_BondsPayableTextBlock" order="0" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/Warrants">
    <loc xlink:type="locator" xlink:label="thcb_WarrantsAbstract" xlink:href="thcb-20210930.xsd#thcb_WarrantsAbstract"/>
    <loc xlink:type="locator" xlink:label="thcb_WarrantsTextBlock" xlink:href="thcb-20210930.xsd#thcb_WarrantsTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_WarrantsAbstract" xlink:to="thcb_WarrantsTextBlock" order="0" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/FairValueMeasurement">
    <loc xlink:type="locator" xlink:label="us-gaap_FairValueDisclosuresAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueDisclosuresAbstract"/>
    <loc xlink:type="locator" xlink:label="us-gaap_FairValueDisclosuresTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueDisclosuresTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueDisclosuresAbstract" xlink:to="us-gaap_FairValueDisclosuresTextBlock" order="0" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/NoncontrollingInterests">
    <loc xlink:type="locator" xlink:label="us-gaap_NoncontrollingInterestAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NoncontrollingInterestAbstract"/>
    <loc xlink:type="locator" xlink:label="us-gaap_MinorityInterestDisclosureTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_MinorityInterestDisclosureTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NoncontrollingInterestAbstract" xlink:to="us-gaap_MinorityInterestDisclosureTextBlock" order="0" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/CommonStock">
    <loc xlink:type="locator" xlink:label="us-gaap_StockholdersEquityNoteAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquityNoteAbstract"/>
    <loc xlink:type="locator" xlink:label="us-gaap_StockholdersEquityNoteDisclosureTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquityNoteDisclosureTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StockholdersEquityNoteAbstract" xlink:to="us-gaap_StockholdersEquityNoteDisclosureTextBlock" order="0" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/PreferredShares">
    <loc xlink:type="locator" xlink:label="thcb_PreferredSharesLineItems" xlink:href="thcb-20210930.xsd#thcb_PreferredSharesLineItems"/>
    <loc xlink:type="locator" xlink:label="thcb_PreferredSharesTable" xlink:href="thcb-20210930.xsd#thcb_PreferredSharesTable"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="thcb_PreferredSharesLineItems" xlink:to="thcb_PreferredSharesTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_PreferredStockTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_PreferredSharesLineItems" xlink:to="us-gaap_PreferredStockTextBlock" order="1" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/Sharebasedpayment">
    <loc xlink:type="locator" xlink:label="us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract"/>
    <loc xlink:type="locator" xlink:label="us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xlink:to="us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock" order="0" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/MainlandChinaContributionPlan">
    <loc xlink:type="locator" xlink:label="us-gaap_CompensationAndRetirementDisclosureAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract"/>
    <loc xlink:type="locator" xlink:label="us-gaap_DefinedContributionPlanTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedContributionPlanTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_CompensationAndRetirementDisclosureAbstract" xlink:to="us-gaap_DefinedContributionPlanTextBlock" order="0" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/RelatedPartyBalancesandTransactions">
    <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyTransactionsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyTransactionsAbstract"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyTransactionsDisclosureTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyTransactionsDisclosureTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyTransactionsAbstract" xlink:to="us-gaap_RelatedPartyTransactionsDisclosureTextBlock" order="0" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/NetLossPerShare">
    <loc xlink:type="locator" xlink:label="us-gaap_EarningsPerShareAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EarningsPerShareAbstract"/>
    <loc xlink:type="locator" xlink:label="us-gaap_EarningsPerShareTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EarningsPerShareTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EarningsPerShareAbstract" xlink:to="us-gaap_EarningsPerShareTextBlock" order="0" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/CommitmentsandContingencies">
    <loc xlink:type="locator" xlink:label="us-gaap_CommitmentsAndContingenciesDisclosureAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureAbstract"/>
    <loc xlink:type="locator" xlink:label="us-gaap_CommitmentsAndContingenciesDisclosureTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_CommitmentsAndContingenciesDisclosureAbstract" xlink:to="us-gaap_CommitmentsAndContingenciesDisclosureTextBlock" order="0" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/SubsequentEvents">
    <loc xlink:type="locator" xlink:label="us-gaap_SubsequentEventsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventsAbstract"/>
    <loc xlink:type="locator" xlink:label="us-gaap_SubsequentEventsTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventsTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SubsequentEventsAbstract" xlink:to="us-gaap_SubsequentEventsTextBlock" order="0" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/AccountingPoliciesByPolicy">
    <loc xlink:type="locator" xlink:label="us-gaap_AccountingPoliciesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountingPoliciesAbstract"/>
    <loc xlink:type="locator" xlink:label="us-gaap_BasisOfAccountingPolicyPolicyTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BasisOfAccountingPolicyPolicyTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccountingPoliciesAbstract" xlink:to="us-gaap_BasisOfAccountingPolicyPolicyTextBlock" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_EmergingGrowthCompanyPolicyTextBlock" xlink:href="thcb-20210930.xsd#thcb_EmergingGrowthCompanyPolicyTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccountingPoliciesAbstract" xlink:to="thcb_EmergingGrowthCompanyPolicyTextBlock" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RevenueRecognitionPolicyTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRecognitionPolicyTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccountingPoliciesAbstract" xlink:to="us-gaap_RevenueRecognitionPolicyTextBlock" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccountingPoliciesAbstract" xlink:to="us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy" order="3" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_WarrantLiabilityPolicyTextBlock" xlink:href="thcb-20210930.xsd#thcb_WarrantLiabilityPolicyTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccountingPoliciesAbstract" xlink:to="thcb_WarrantLiabilityPolicyTextBlock" order="4" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/ReverseRecapitalizationTables">
    <loc xlink:type="locator" xlink:label="thcb_ReverseRecapitalizationAbstract" xlink:href="thcb-20210930.xsd#thcb_ReverseRecapitalizationAbstract"/>
    <loc xlink:type="locator" xlink:label="thcb_ScheduleOfBusinessCombinationTheOwnershipInterestsOfTheCompanysStockholdersTableTextBlock" xlink:href="thcb-20210930.xsd#thcb_ScheduleOfBusinessCombinationTheOwnershipInterestsOfTheCompanysStockholdersTableTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ReverseRecapitalizationAbstract" xlink:to="thcb_ScheduleOfBusinessCombinationTheOwnershipInterestsOfTheCompanysStockholdersTableTextBlock" order="0" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/AccountsReceivableTables">
    <loc xlink:type="locator" xlink:label="us-gaap_ReceivablesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ReceivablesAbstract"/>
    <loc xlink:type="locator" xlink:label="thcb_ScheduleOfAccountsReceivableTableTextBlock" xlink:href="thcb-20210930.xsd#thcb_ScheduleOfAccountsReceivableTableTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ReceivablesAbstract" xlink:to="thcb_ScheduleOfAccountsReceivableTableTextBlock" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_ScheduleOfAllowanceForDoubtfulAccountsTableTextBlock" xlink:href="thcb-20210930.xsd#thcb_ScheduleOfAllowanceForDoubtfulAccountsTableTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ReceivablesAbstract" xlink:to="thcb_ScheduleOfAllowanceForDoubtfulAccountsTableTextBlock" order="1" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/InventoriesNetTables">
    <loc xlink:type="locator" xlink:label="us-gaap_InventoryDisclosureAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InventoryDisclosureAbstract"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfInventoryCurrentTableTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfInventoryCurrentTableTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InventoryDisclosureAbstract" xlink:to="us-gaap_ScheduleOfInventoryCurrentTableTextBlock" order="0" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/PrepaidExpensesandOtherCurrentAssetsTables">
    <loc xlink:type="locator" xlink:label="thcb_PrepaidExpensesAndOtherCurrentAssetsAbstract" xlink:href="thcb-20210930.xsd#thcb_PrepaidExpensesAndOtherCurrentAssetsAbstract"/>
    <loc xlink:type="locator" xlink:label="us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_PrepaidExpensesAndOtherCurrentAssetsAbstract" xlink:to="us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureTextBlock" order="0" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/AccruedExpensesandOtherCurrentLiabilitiesTables">
    <loc xlink:type="locator" xlink:label="us-gaap_AccruedLiabilitiesAndOtherLiabilitiesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccruedLiabilitiesAndOtherLiabilitiesAbstract"/>
    <loc xlink:type="locator" xlink:label="thcb_AccruedExpensesAndOtherCurrentLiabilitiesTableTextBlock" xlink:href="thcb-20210930.xsd#thcb_AccruedExpensesAndOtherCurrentLiabilitiesTableTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccruedLiabilitiesAndOtherLiabilitiesAbstract" xlink:to="thcb_AccruedExpensesAndOtherCurrentLiabilitiesTableTextBlock" order="0" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/ProductWarrantyTables">
    <loc xlink:type="locator" xlink:label="us-gaap_ProductWarrantiesDisclosuresAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProductWarrantiesDisclosuresAbstract"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfProductInformationTableTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfProductInformationTableTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ProductWarrantiesDisclosuresAbstract" xlink:to="us-gaap_ScheduleOfProductInformationTableTextBlock" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfProductWarrantyLiabilityTableTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfProductWarrantyLiabilityTableTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ProductWarrantiesDisclosuresAbstract" xlink:to="us-gaap_ScheduleOfProductWarrantyLiabilityTableTextBlock" order="1" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/BankBorrowingsTables">
    <loc xlink:type="locator" xlink:label="thcb_BankBorrowingsAbstract" xlink:href="thcb-20210930.xsd#thcb_BankBorrowingsAbstract"/>
    <loc xlink:type="locator" xlink:label="thcb_ScheduleOfBankBorrowingsTableTextBlock" xlink:href="thcb-20210930.xsd#thcb_ScheduleOfBankBorrowingsTableTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_BankBorrowingsAbstract" xlink:to="thcb_ScheduleOfBankBorrowingsTableTextBlock" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_ScheduleOfBankingFacilitiesAndAggregateCarryingAmount" xlink:href="thcb-20210930.xsd#thcb_ScheduleOfBankingFacilitiesAndAggregateCarryingAmount"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_BankBorrowingsAbstract" xlink:to="thcb_ScheduleOfBankingFacilitiesAndAggregateCarryingAmount" order="1" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/OtherNonCurrentLiabilitiesTables">
    <loc xlink:type="locator" xlink:label="us-gaap_OtherLiabilitiesNoncurrentAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrentAbstract"/>
    <loc xlink:type="locator" xlink:label="thcb_ScheduleOfOtherNonCurrentLiabilities" xlink:href="thcb-20210930.xsd#thcb_ScheduleOfOtherNonCurrentLiabilities"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OtherLiabilitiesNoncurrentAbstract" xlink:to="thcb_ScheduleOfOtherNonCurrentLiabilities" order="0" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/BondsPayableTables">
    <loc xlink:type="locator" xlink:label="thcb_BondsPayableAbstract" xlink:href="thcb-20210930.xsd#thcb_BondsPayableAbstract"/>
    <loc xlink:type="locator" xlink:label="thcb_ScheduleOfBondsPayableTableTextBlock" xlink:href="thcb-20210930.xsd#thcb_ScheduleOfBondsPayableTableTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_BondsPayableAbstract" xlink:to="thcb_ScheduleOfBondsPayableTableTextBlock" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_ScheduleOfRepaymentsAndInterestsTableTextBlock" xlink:href="thcb-20210930.xsd#thcb_ScheduleOfRepaymentsAndInterestsTableTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_BondsPayableAbstract" xlink:to="thcb_ScheduleOfRepaymentsAndInterestsTableTextBlock" order="1" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/WarrantsTables">
    <loc xlink:type="locator" xlink:label="thcb_WarrantsAbstract" xlink:href="thcb-20210930.xsd#thcb_WarrantsAbstract"/>
    <loc xlink:type="locator" xlink:label="thcb_ScheduleOfUnderTheBinomialLatticeModelBLMThatAssumesOptimalExerciseOfTheCompanysRedemptionOptionTableTextBlock" xlink:href="thcb-20210930.xsd#thcb_ScheduleOfUnderTheBinomialLatticeModelBLMThatAssumesOptimalExerciseOfTheCompanysRedemptionOptionTableTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_WarrantsAbstract" xlink:to="thcb_ScheduleOfUnderTheBinomialLatticeModelBLMThatAssumesOptimalExerciseOfTheCompanysRedemptionOptionTableTextBlock" order="0" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/FairValueMeasurementTables">
    <loc xlink:type="locator" xlink:label="us-gaap_FairValueDisclosuresAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueDisclosuresAbstract"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueDisclosuresAbstract" xlink:to="us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTableTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTableTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueDisclosuresAbstract" xlink:to="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTableTextBlock" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueDisclosuresAbstract" xlink:to="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock" order="2" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/PreferredSharesTables">
    <loc xlink:type="locator" xlink:label="thcb_PreferredSharesTablesLineItems" xlink:href="thcb-20210930.xsd#thcb_PreferredSharesTablesLineItems"/>
    <loc xlink:type="locator" xlink:label="thcb_PreferredSharesTablesTable" xlink:href="thcb-20210930.xsd#thcb_PreferredSharesTablesTable"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="thcb_PreferredSharesTablesLineItems" xlink:to="thcb_PreferredSharesTablesTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfPreferredUnitsTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfPreferredUnitsTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_PreferredSharesTablesLineItems" xlink:to="us-gaap_ScheduleOfPreferredUnitsTextBlock" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RedeemableNoncontrollingInterestTableTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RedeemableNoncontrollingInterestTableTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_PreferredSharesTablesLineItems" xlink:to="us-gaap_RedeemableNoncontrollingInterestTableTextBlock" order="2" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/SharebasedpaymentTables">
    <loc xlink:type="locator" xlink:label="us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xlink:to="us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xlink:to="us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfNonvestedShareActivityTableTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfNonvestedShareActivityTableTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xlink:to="us-gaap_ScheduleOfNonvestedShareActivityTableTextBlock" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xlink:to="us-gaap_DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock" order="3" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/RelatedPartyBalancesandTransactionsTables">
    <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyTransactionsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyTransactionsAbstract"/>
    <loc xlink:type="locator" xlink:label="thcb_ScheduleOfRelationshipTableTextBlock" xlink:href="thcb-20210930.xsd#thcb_ScheduleOfRelationshipTableTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyTransactionsAbstract" xlink:to="thcb_ScheduleOfRelationshipTableTextBlock" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfRelatedPartyTransactionsTableTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsTableTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyTransactionsAbstract" xlink:to="us-gaap_ScheduleOfRelatedPartyTransactionsTableTextBlock" order="1" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/NetLossPerShareTables">
    <loc xlink:type="locator" xlink:label="us-gaap_EarningsPerShareAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EarningsPerShareAbstract"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EarningsPerShareAbstract" xlink:to="us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValueTableTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValueTableTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EarningsPerShareAbstract" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValueTableTextBlock" order="1" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/CommitmentsandContingenciesTables">
    <loc xlink:type="locator" xlink:label="us-gaap_CommitmentsAndContingenciesDisclosureAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureAbstract"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfFutureMinimumLeasePaymentsForCapitalLeasesTableTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfFutureMinimumLeasePaymentsForCapitalLeasesTableTextBlock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_CommitmentsAndContingenciesDisclosureAbstract" xlink:to="us-gaap_ScheduleOfFutureMinimumLeasePaymentsForCapitalLeasesTableTextBlock" order="0" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/ScheduleofbusinesscombinationtheownershipinterestsofthecompanysstockholdersTable">
    <loc xlink:type="locator" xlink:label="thcb_ScheduleOfBusinessCombinationTheOwnershipInterestsOfTheCompanySStockholdersAbstract" xlink:href="thcb-20210930.xsd#thcb_ScheduleOfBusinessCombinationTheOwnershipInterestsOfTheCompanySStockholdersAbstract"/>
    <loc xlink:type="locator" xlink:label="thcb_ExistingMicrovastEquityHolders" xlink:href="thcb-20210930.xsd#thcb_ExistingMicrovastEquityHolders"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfBusinessCombinationTheOwnershipInterestsOfTheCompanySStockholdersAbstract" xlink:to="thcb_ExistingMicrovastEquityHolders" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_ExistingMicrovastConvertibleNoteholdersinShares" xlink:href="thcb-20210930.xsd#thcb_ExistingMicrovastConvertibleNoteholdersinShares"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfBusinessCombinationTheOwnershipInterestsOfTheCompanySStockholdersAbstract" xlink:to="thcb_ExistingMicrovastConvertibleNoteholdersinShares" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_TuscanPublicStockholders" xlink:href="thcb-20210930.xsd#thcb_TuscanPublicStockholders"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfBusinessCombinationTheOwnershipInterestsOfTheCompanySStockholdersAbstract" xlink:to="thcb_TuscanPublicStockholders" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_SponsorGroupinShares" xlink:href="thcb-20210930.xsd#thcb_SponsorGroupinShares"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfBusinessCombinationTheOwnershipInterestsOfTheCompanySStockholdersAbstract" xlink:to="thcb_SponsorGroupinShares" order="3" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_EarlyBirdCapital" xlink:href="thcb-20210930.xsd#thcb_EarlyBirdCapital"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfBusinessCombinationTheOwnershipInterestsOfTheCompanySStockholdersAbstract" xlink:to="thcb_EarlyBirdCapital" order="4" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_SharesOutstandingPIPEInvestorsImmediatelyAfterMerger" xlink:href="thcb-20210930.xsd#thcb_SharesOutstandingPIPEInvestorsImmediatelyAfterMerger"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfBusinessCombinationTheOwnershipInterestsOfTheCompanySStockholdersAbstract" xlink:to="thcb_SharesOutstandingPIPEInvestorsImmediatelyAfterMerger" order="5" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_CommonStock" xlink:href="thcb-20210930.xsd#thcb_CommonStock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfBusinessCombinationTheOwnershipInterestsOfTheCompanySStockholdersAbstract" xlink:to="thcb_CommonStock" order="6" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/ScheduleofaccountsreceivableTable">
    <loc xlink:type="locator" xlink:label="thcb_ScheduleOfAccountsReceivableAbstract" xlink:href="thcb-20210930.xsd#thcb_ScheduleOfAccountsReceivableAbstract"/>
    <loc xlink:type="locator" xlink:label="us-gaap_AccountsReceivableGrossCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountsReceivableGrossCurrent"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfAccountsReceivableAbstract" xlink:to="us-gaap_AccountsReceivableGrossCurrent" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfAccountsReceivableAbstract" xlink:to="us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_AccountsReceivableNetCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfAccountsReceivableAbstract" xlink:to="us-gaap_AccountsReceivableNetCurrent" order="2" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/ScheduleofallowancefordoubtfulaccountsTable">
    <loc xlink:type="locator" xlink:label="thcb_ScheduleOfAllowanceForDoubtfulAccountsAbstract" xlink:href="thcb-20210930.xsd#thcb_ScheduleOfAllowanceForDoubtfulAccountsAbstract"/>
    <loc xlink:type="locator" xlink:label="thcb_AllowanceForDoubtfulAccountReceivable" xlink:href="thcb-20210930.xsd#thcb_AllowanceForDoubtfulAccountReceivable"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfAllowanceForDoubtfulAccountsAbstract" xlink:to="thcb_AllowanceForDoubtfulAccountReceivable" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_ChargeToExpenses" xlink:href="thcb-20210930.xsd#thcb_ChargeToExpenses"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfAllowanceForDoubtfulAccountsAbstract" xlink:to="thcb_ChargeToExpenses" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_AccountsReceivableWriteOff" xlink:href="thcb-20210930.xsd#thcb_AccountsReceivableWriteOff"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfAllowanceForDoubtfulAccountsAbstract" xlink:to="thcb_AccountsReceivableWriteOff" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfAllowanceForDoubtfulAccountsAbstract" xlink:to="us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease" order="3" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/ScheduleofInventoriesTable">
    <loc xlink:type="locator" xlink:label="thcb_ScheduleOfInventoriesAbstract" xlink:href="thcb-20210930.xsd#thcb_ScheduleOfInventoriesAbstract"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InventoryRawMaterialsNetOfReserves" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InventoryRawMaterialsNetOfReserves"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfInventoriesAbstract" xlink:to="us-gaap_InventoryRawMaterialsNetOfReserves" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InventoryWorkInProcessNetOfReserves" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InventoryWorkInProcessNetOfReserves"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfInventoriesAbstract" xlink:to="us-gaap_InventoryWorkInProcessNetOfReserves" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InventoryFinishedGoodsNetOfReserves" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InventoryFinishedGoodsNetOfReserves"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfInventoriesAbstract" xlink:to="us-gaap_InventoryFinishedGoodsNetOfReserves" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InventoryNet" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InventoryNet"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfInventoriesAbstract" xlink:to="us-gaap_InventoryNet" order="3" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/ScheduleofreceivablesrepresentedtheamountavailableforfuturedeductionagainstVATpayableTable">
    <loc xlink:type="locator" xlink:label="thcb_ScheduleOfReceivablesRepresentedTheAmountAvailableForFutureDeductionAgainstVatPayableAbstract" xlink:href="thcb-20210930.xsd#thcb_ScheduleOfReceivablesRepresentedTheAmountAvailableForFutureDeductionAgainstVatPayableAbstract"/>
    <loc xlink:type="locator" xlink:label="us-gaap_Supplies" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Supplies"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfReceivablesRepresentedTheAmountAvailableForFutureDeductionAgainstVatPayableAbstract" xlink:to="us-gaap_Supplies" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_OtherReceivables" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherReceivables"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfReceivablesRepresentedTheAmountAvailableForFutureDeductionAgainstVatPayableAbstract" xlink:to="us-gaap_OtherReceivables" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ValueAddedTaxReceivable" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ValueAddedTaxReceivable"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfReceivablesRepresentedTheAmountAvailableForFutureDeductionAgainstVatPayableAbstract" xlink:to="us-gaap_ValueAddedTaxReceivable" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_DepositAssets" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DepositAssets"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfReceivablesRepresentedTheAmountAvailableForFutureDeductionAgainstVatPayableAbstract" xlink:to="us-gaap_DepositAssets" order="3" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_PrepaidExpenseCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PrepaidExpenseCurrent"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfReceivablesRepresentedTheAmountAvailableForFutureDeductionAgainstVatPayableAbstract" xlink:to="us-gaap_PrepaidExpenseCurrent" order="4" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/ScheduleofaccruedexpensesandothercurrentliabilitiesTable">
    <loc xlink:type="locator" xlink:label="thcb_ScheduleOfAccruedExpensesAndOtherCurrentLiabilitiesAbstract" xlink:href="thcb-20210930.xsd#thcb_ScheduleOfAccruedExpensesAndOtherCurrentLiabilitiesAbstract"/>
    <loc xlink:type="locator" xlink:label="thcb_PayableToExitingInvestors" xlink:href="thcb-20210930.xsd#thcb_PayableToExitingInvestors"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfAccruedExpensesAndOtherCurrentLiabilitiesAbstract" xlink:to="thcb_PayableToExitingInvestors" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_PayablesForPurchaseOfPropertyPlantAndEquipment" xlink:href="thcb-20210930.xsd#thcb_PayablesForPurchaseOfPropertyPlantAndEquipment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfAccruedExpensesAndOtherCurrentLiabilitiesAbstract" xlink:to="thcb_PayablesForPurchaseOfPropertyPlantAndEquipment" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ProductWarrantyAccrualClassifiedCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProductWarrantyAccrualClassifiedCurrent"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfAccruedExpensesAndOtherCurrentLiabilitiesAbstract" xlink:to="us-gaap_ProductWarrantyAccrualClassifiedCurrent" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_OtherAccruedLiabilitiesCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherAccruedLiabilitiesCurrent"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfAccruedExpensesAndOtherCurrentLiabilitiesAbstract" xlink:to="us-gaap_OtherAccruedLiabilitiesCurrent" order="3" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_AccruedPayrollAndWelfare1" xlink:href="thcb-20210930.xsd#thcb_AccruedPayrollAndWelfare1"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfAccruedExpensesAndOtherCurrentLiabilitiesAbstract" xlink:to="thcb_AccruedPayrollAndWelfare1" order="4" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InterestPayableCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestPayableCurrent"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfAccruedExpensesAndOtherCurrentLiabilitiesAbstract" xlink:to="us-gaap_InterestPayableCurrent" order="5" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_OtherLiabilities" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherLiabilities"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfAccruedExpensesAndOtherCurrentLiabilitiesAbstract" xlink:to="us-gaap_OtherLiabilities" order="6" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrentAndNoncurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrentAndNoncurrent"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfAccruedExpensesAndOtherCurrentLiabilitiesAbstract" xlink:to="us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrentAndNoncurrent" order="7" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_AccruedLiabilitiesCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfAccruedExpensesAndOtherCurrentLiabilitiesAbstract" xlink:to="us-gaap_AccruedLiabilitiesCurrent" order="8" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/ScheduleofmovementofproductwarrantyTable">
    <loc xlink:type="locator" xlink:label="thcb_ScheduleOfMovementOfProductWarrantyAbstract" xlink:href="thcb-20210930.xsd#thcb_ScheduleOfMovementOfProductWarrantyAbstract"/>
    <loc xlink:type="locator" xlink:label="thcb_MovementOfProductWarrantyOpeningBalance" xlink:href="thcb-20210930.xsd#thcb_MovementOfProductWarrantyOpeningBalance"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfMovementOfProductWarrantyAbstract" xlink:to="thcb_MovementOfProductWarrantyOpeningBalance" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_Warrantyexpenseprovidedduringtheperiod" xlink:href="thcb-20210930.xsd#thcb_Warrantyexpenseprovidedduringtheperiod"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfMovementOfProductWarrantyAbstract" xlink:to="thcb_Warrantyexpenseprovidedduringtheperiod" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_WarrantsExpense" xlink:href="thcb-20210930.xsd#thcb_WarrantsExpense"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfMovementOfProductWarrantyAbstract" xlink:to="thcb_WarrantsExpense" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_utilizationoftheproductwarrantyduringtheperiod" xlink:href="thcb-20210930.xsd#thcb_utilizationoftheproductwarrantyduringtheperiod"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfMovementOfProductWarrantyAbstract" xlink:to="thcb_utilizationoftheproductwarrantyduringtheperiod" order="3" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_MovementOfProductWarrantyEndingBalance" xlink:href="thcb-20210930.xsd#thcb_MovementOfProductWarrantyEndingBalance"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfMovementOfProductWarrantyAbstract" xlink:to="thcb_MovementOfProductWarrantyEndingBalance" order="4" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/ScheduleofwarrantycostTable">
    <loc xlink:type="locator" xlink:label="thcb_ScheduleOfWarrantyCostAbstract" xlink:href="thcb-20210930.xsd#thcb_ScheduleOfWarrantyCostAbstract"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ProductWarrantyAccrualClassifiedCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProductWarrantyAccrualClassifiedCurrent"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfWarrantyCostAbstract" xlink:to="us-gaap_ProductWarrantyAccrualClassifiedCurrent" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ProductWarrantyAccrualNoncurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProductWarrantyAccrualNoncurrent"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfWarrantyCostAbstract" xlink:to="us-gaap_ProductWarrantyAccrualNoncurrent" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_ProductWarrantyTotal" xlink:href="thcb-20210930.xsd#thcb_ProductWarrantyTotal"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfWarrantyCostAbstract" xlink:to="thcb_ProductWarrantyTotal" order="2" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/ScheduleofbankborrowingsTable">
    <loc xlink:type="locator" xlink:label="thcb_ScheduleOfBankBorrowingsAbstract" xlink:href="thcb-20210930.xsd#thcb_ScheduleOfBankBorrowingsAbstract"/>
    <loc xlink:type="locator" xlink:label="thcb_BankBorrowingsBeginningBalance" xlink:href="thcb-20210930.xsd#thcb_BankBorrowingsBeginningBalance"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfBankBorrowingsAbstract" xlink:to="thcb_BankBorrowingsBeginningBalance" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ProceedsFromIssuanceOfDebt" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromIssuanceOfDebt"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfBankBorrowingsAbstract" xlink:to="us-gaap_ProceedsFromIssuanceOfDebt" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_RepaymentsOfPrincipal" xlink:href="thcb-20210930.xsd#thcb_RepaymentsOfPrincipal"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfBankBorrowingsAbstract" xlink:to="thcb_RepaymentsOfPrincipal" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_ExchangeDifference" xlink:href="thcb-20210930.xsd#thcb_ExchangeDifference"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfBankBorrowingsAbstract" xlink:to="thcb_ExchangeDifference" order="3" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_BankBorrowingsEndingBalance" xlink:href="thcb-20210930.xsd#thcb_BankBorrowingsEndingBalance"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfBankBorrowingsAbstract" xlink:to="thcb_BankBorrowingsEndingBalance" order="4" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/ScheduleofbankingfacilitiesandaggregatecarryingamountTable">
    <loc xlink:type="locator" xlink:label="thcb_ScheduleOfBankingFacilitiesAndAggregateCarryingAmountAbstract" xlink:href="thcb-20210930.xsd#thcb_ScheduleOfBankingFacilitiesAndAggregateCarryingAmountAbstract"/>
    <loc xlink:type="locator" xlink:label="thcb_PledgedBuildings" xlink:href="thcb-20210930.xsd#thcb_PledgedBuildings"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfBankingFacilitiesAndAggregateCarryingAmountAbstract" xlink:to="thcb_PledgedBuildings" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_PledgedMachineryAndEquipmentGross" xlink:href="thcb-20210930.xsd#thcb_PledgedMachineryAndEquipmentGross"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfBankingFacilitiesAndAggregateCarryingAmountAbstract" xlink:to="thcb_PledgedMachineryAndEquipmentGross" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_PledgedLandUseRights" xlink:href="thcb-20210930.xsd#thcb_PledgedLandUseRights"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfBankingFacilitiesAndAggregateCarryingAmountAbstract" xlink:to="thcb_PledgedLandUseRights" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_PledgedTotalAsset" xlink:href="thcb-20210930.xsd#thcb_PledgedTotalAsset"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfBankingFacilitiesAndAggregateCarryingAmountAbstract" xlink:to="thcb_PledgedTotalAsset" order="3" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/ScheduleofotherNonCurrentLiabilitiesTable">
    <loc xlink:type="locator" xlink:label="thcb_ScheduleOfOtherNonCurrentLiabilitiesAbstract" xlink:href="thcb-20210930.xsd#thcb_ScheduleOfOtherNonCurrentLiabilitiesAbstract"/>
    <loc xlink:type="locator" xlink:label="thcb_PayablesToExitingInvestor" xlink:href="thcb-20210930.xsd#thcb_PayablesToExitingInvestor"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfOtherNonCurrentLiabilitiesAbstract" xlink:to="thcb_PayablesToExitingInvestor" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ProductWarrantyAccrualNoncurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProductWarrantyAccrualNoncurrent"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfOtherNonCurrentLiabilitiesAbstract" xlink:to="us-gaap_ProductWarrantyAccrualNoncurrent" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_DeferredSubsidyIncomeNoncurrent" xlink:href="thcb-20210930.xsd#thcb_DeferredSubsidyIncomeNoncurrent"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfOtherNonCurrentLiabilitiesAbstract" xlink:to="thcb_DeferredSubsidyIncomeNoncurrent" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_OtherLiabilitiesNoncurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfOtherNonCurrentLiabilitiesAbstract" xlink:to="us-gaap_OtherLiabilitiesNoncurrent" order="3" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/ScheduleofbondspayableTable">
    <loc xlink:type="locator" xlink:label="thcb_BondsPayableDetailsScheduleofbondspayableLineItems" xlink:href="thcb-20210930.xsd#thcb_BondsPayableDetailsScheduleofbondspayableLineItems"/>
    <loc xlink:type="locator" xlink:label="thcb_BondsPayableDetailsScheduleofbondspayableTable" xlink:href="thcb-20210930.xsd#thcb_BondsPayableDetailsScheduleofbondspayableTable"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="thcb_BondsPayableDetailsScheduleofbondspayableLineItems" xlink:to="thcb_BondsPayableDetailsScheduleofbondspayableTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="thcb_BondsPayableDetailsScheduleofbondspayableTable" xlink:to="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:to="us-gaap_RelatedPartyDomain" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyDomain_0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:to="us-gaap_RelatedPartyDomain_0" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_ThirdpartyInvestorsMember" xlink:href="thcb-20210930.xsd#thcb_ThirdpartyInvestorsMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyDomain" xlink:to="thcb_ThirdpartyInvestorsMember" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_HuzhouSaiyuanMember" xlink:href="thcb-20210930.xsd#thcb_HuzhouSaiyuanMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyDomain" xlink:to="thcb_HuzhouSaiyuanMember" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_BondsPayableAbstract0" xlink:href="thcb-20210930.xsd#thcb_BondsPayableAbstract0"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_BondsPayableDetailsScheduleofbondspayableLineItems" xlink:to="thcb_BondsPayableAbstract0" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_BondsPayableCurrent" xlink:href="thcb-20210930.xsd#thcb_BondsPayableCurrent"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_BondsPayableAbstract0" xlink:to="thcb_BondsPayableCurrent" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_LongTermBondsPayableAbstract" xlink:href="thcb-20210930.xsd#thcb_LongTermBondsPayableAbstract"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_BondsPayableDetailsScheduleofbondspayableLineItems" xlink:to="thcb_LongTermBondsPayableAbstract" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_LongTermBondsPayable" xlink:href="thcb-20210930.xsd#thcb_LongTermBondsPayable"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_LongTermBondsPayableAbstract" xlink:to="thcb_LongTermBondsPayable" order="0" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/ScheduleofrepaymentsandinterestsTable">
    <loc xlink:type="locator" xlink:label="thcb_BondsPayableDetailsScheduleofrepaymentsandinterestsLineItems" xlink:href="thcb-20210930.xsd#thcb_BondsPayableDetailsScheduleofrepaymentsandinterestsLineItems"/>
    <loc xlink:type="locator" xlink:label="thcb_BondsPayableDetailsScheduleofrepaymentsandinterestsTable" xlink:href="thcb-20210930.xsd#thcb_BondsPayableDetailsScheduleofrepaymentsandinterestsTable"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="thcb_BondsPayableDetailsScheduleofrepaymentsandinterestsLineItems" xlink:to="thcb_BondsPayableDetailsScheduleofrepaymentsandinterestsTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="srt_RangeAxis" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="thcb_BondsPayableDetailsScheduleofrepaymentsandinterestsTable" xlink:to="srt_RangeAxis" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="srt_RangeMember" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="srt_RangeAxis" xlink:to="srt_RangeMember" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="srt_RangeMember_0" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
<!-- [WMV5][XcpuxYn59dz7vgYynUDuwG7r97K2jUTysl7vcz0lJt/tSeJz73kx1cLt0ZFF2SK/vxBCY0vdSrYqZsk5psOI8vY31hMACnam7jYkxg1suD2aKgSa9FOwcvgjgrFxIWENZgDGeo36on69axiV+RNW4Bul4pPx/IqF9/Vu+qudV+5q+EVQ31G/GE0smmx6wjlDt7ANyep2heGsAXzmK+9zKYbRF88cTN34/1O48MfXmIX6caKkmDwH5k8zt6iPAmdyXkXlEzR/cFnVcpWMXPpymMMx2VfC4GYU] CSR-->
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="srt_RangeAxis" xlink:to="srt_RangeMember_0" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_AwardDateAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardDateAxis"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="thcb_BondsPayableDetailsScheduleofrepaymentsandinterestsTable" xlink:to="us-gaap_AwardDateAxis" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_AwardDateDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardDateDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_AwardDateAxis" xlink:to="us-gaap_AwardDateDomain" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_AwardDateDomain_0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardDateDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_AwardDateAxis" xlink:to="us-gaap_AwardDateDomain_0" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_JuneThirtyTwentyTwentyThreeMember" xlink:href="thcb-20210930.xsd#thcb_JuneThirtyTwentyTwentyThreeMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AwardDateDomain" xlink:to="thcb_JuneThirtyTwentyTwentyThreeMember" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_AprilTwentyEightMember" xlink:href="thcb-20210930.xsd#thcb_AprilTwentyEightMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AwardDateDomain" xlink:to="thcb_AprilTwentyEightMember" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_JulyElevenMember" xlink:href="thcb-20210930.xsd#thcb_JulyElevenMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AwardDateDomain" xlink:to="thcb_JulyElevenMember" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_OctoberOneMember" xlink:href="thcb-20210930.xsd#thcb_OctoberOneMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AwardDateDomain" xlink:to="thcb_OctoberOneMember" order="3" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_AprilThirteenMember" xlink:href="thcb-20210930.xsd#thcb_AprilThirteenMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AwardDateDomain" xlink:to="thcb_AprilThirteenMember" order="4" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="srt_MinimumMember" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MinimumMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_RangeMember" xlink:to="srt_MinimumMember" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="srt_MaximumMember" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_RangeMember" xlink:to="srt_MaximumMember" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_DebtInstrumentIssuanceDate1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentIssuanceDate1"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_BondsPayableDetailsScheduleofrepaymentsandinterestsLineItems" xlink:to="us-gaap_DebtInstrumentIssuanceDate1" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_DebtInstrumentOfSubscribedAmount" xlink:href="thcb-20210930.xsd#thcb_DebtInstrumentOfSubscribedAmount"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_BondsPayableDetailsScheduleofrepaymentsandinterestsLineItems" xlink:to="thcb_DebtInstrumentOfSubscribedAmount" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_DebtInstrumentMaturityDate" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentMaturityDate"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_BondsPayableDetailsScheduleofrepaymentsandinterestsLineItems" xlink:to="us-gaap_DebtInstrumentMaturityDate" order="3" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_DebtInstrumentOfRepaymentAmount" xlink:href="thcb-20210930.xsd#thcb_DebtInstrumentOfRepaymentAmount"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_BondsPayableDetailsScheduleofrepaymentsandinterestsLineItems" xlink:to="thcb_DebtInstrumentOfRepaymentAmount" order="4" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_BondsPayableDetailsScheduleofrepaymentsandinterestsLineItems" xlink:to="us-gaap_DebtInstrumentInterestRateStatedPercentage" order="5" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/ScheduleofundertheBinomialLatticeModelBLMthatassumesoptimalexerciseoftheCompanysredemptionoptionTable">
    <loc xlink:type="locator" xlink:label="thcb_ScheduleOfUnderTheBinomialLatticeModelBlmThatAssumesOptimalExerciseOfTheCompanySRedemptionOptionAbstract" xlink:href="thcb-20210930.xsd#thcb_ScheduleOfUnderTheBinomialLatticeModelBlmThatAssumesOptimalExerciseOfTheCompanySRedemptionOptionAbstract"/>
    <loc xlink:type="locator" xlink:label="us-gaap_SharePrice" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharePrice"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfUnderTheBinomialLatticeModelBlmThatAssumesOptimalExerciseOfTheCompanySRedemptionOptionAbstract" xlink:to="us-gaap_SharePrice" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePrice" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePrice"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfUnderTheBinomialLatticeModelBlmThatAssumesOptimalExerciseOfTheCompanySRedemptionOptionAbstract" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePrice" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfUnderTheBinomialLatticeModelBlmThatAssumesOptimalExerciseOfTheCompanySRedemptionOptionAbstract" xlink:to="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfUnderTheBinomialLatticeModelBlmThatAssumesOptimalExerciseOfTheCompanySRedemptionOptionAbstract" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" order="3" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfUnderTheBinomialLatticeModelBlmThatAssumesOptimalExerciseOfTheCompanySRedemptionOptionAbstract" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" order="4" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionValuationMethodExpectedDividendRate" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionValuationMethodExpectedDividendRate"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfUnderTheBinomialLatticeModelBlmThatAssumesOptimalExerciseOfTheCompanySRedemptionOptionAbstract" xlink:to="us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionValuationMethodExpectedDividendRate" order="5" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/ScheduleoffairvaluemeasurementsofgroupsassetsandliabilitiesofrecurringbasisTable">
    <loc xlink:type="locator" xlink:label="thcb_FairValueMeasurementDetailsScheduleoffairvaluemeasurementsofgroupsassetsandliabilitiesofrecurringbasisLineItems" xlink:href="thcb-20210930.xsd#thcb_FairValueMeasurementDetailsScheduleoffairvaluemeasurementsofgroupsassetsandliabilitiesofrecurringbasisLineItems"/>
    <loc xlink:type="locator" xlink:label="thcb_FairValueMeasurementDetailsScheduleoffairvaluemeasurementsofgroupsassetsandliabilitiesofrecurringbasisTable" xlink:href="thcb-20210930.xsd#thcb_FairValueMeasurementDetailsScheduleoffairvaluemeasurementsofgroupsassetsandliabilitiesofrecurringbasisTable"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="thcb_FairValueMeasurementDetailsScheduleoffairvaluemeasurementsofgroupsassetsandliabilitiesofrecurringbasisLineItems" xlink:to="thcb_FairValueMeasurementDetailsScheduleoffairvaluemeasurementsofgroupsassetsandliabilitiesofrecurringbasisTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="thcb_FairValueMeasurementDetailsScheduleoffairvaluemeasurementsofgroupsassetsandliabilitiesofrecurringbasisTable" xlink:to="us-gaap_FairValueByFairValueHierarchyLevelAxis" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:to="us-gaap_FairValueMeasurementsFairValueHierarchyDomain" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_FairValueMeasurementsFairValueHierarchyDomain_0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:to="us-gaap_FairValueMeasurementsFairValueHierarchyDomain_0" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_FairValueInputsLevel1Member" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:to="us-gaap_FairValueInputsLevel1Member" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_FairValueInputsLevel2Member" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:to="us-gaap_FairValueInputsLevel2Member" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_FairValueInputsLevel3Member" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:to="us-gaap_FairValueInputsLevel3Member" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_CashEquivalentsAtCarryingValue" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashEquivalentsAtCarryingValue"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_FairValueMeasurementDetailsScheduleoffairvaluemeasurementsofgroupsassetsandliabilitiesofrecurringbasisLineItems" xlink:to="us-gaap_CashEquivalentsAtCarryingValue" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RestrictedCash" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedCash"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_FairValueMeasurementDetailsScheduleoffairvaluemeasurementsofgroupsassetsandliabilitiesofrecurringbasisLineItems" xlink:to="us-gaap_RestrictedCash" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_AssetsFairValueDisclosure" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_FairValueMeasurementDetailsScheduleoffairvaluemeasurementsofgroupsassetsandliabilitiesofrecurringbasisLineItems" xlink:to="us-gaap_AssetsFairValueDisclosure" order="3" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_DerivativeLiabilities" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeLiabilities"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_FairValueMeasurementDetailsScheduleoffairvaluemeasurementsofgroupsassetsandliabilitiesofrecurringbasisLineItems" xlink:to="us-gaap_DerivativeLiabilities" order="4" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_FinancialLiabilitiesFairValueDisclosure" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinancialLiabilitiesFairValueDisclosure"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_FairValueMeasurementDetailsScheduleoffairvaluemeasurementsofgroupsassetsandliabilitiesofrecurringbasisLineItems" xlink:to="us-gaap_FinancialLiabilitiesFairValueDisclosure" order="5" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_Cash" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Cash"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_FairValueMeasurementDetailsScheduleoffairvaluemeasurementsofgroupsassetsandliabilitiesofrecurringbasisLineItems" xlink:to="us-gaap_Cash" order="6" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/ScheduleofreconciliationofthebeginningandendingbalancesforassetsandliabilitiesmeasuredatfairvalueonarecurringbasisTable">
    <loc xlink:type="locator" xlink:label="thcb_ScheduleOfReconciliationOfTheBeginningAndEndingBalancesForAssetsAndLiabilitiesMeasuredAtFairValueOnARecurringBasisAbstract" xlink:href="thcb-20210930.xsd#thcb_ScheduleOfReconciliationOfTheBeginningAndEndingBalancesForAssetsAndLiabilitiesMeasuredAtFairValueOnARecurringBasisAbstract"/>
    <loc xlink:type="locator" xlink:label="thcb_ConvertibleNotesMeasuredatFairValue" xlink:href="thcb-20210930.xsd#thcb_ConvertibleNotesMeasuredatFairValue"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfReconciliationOfTheBeginningAndEndingBalancesForAssetsAndLiabilitiesMeasuredAtFairValueOnARecurringBasisAbstract" xlink:to="thcb_ConvertibleNotesMeasuredatFairValue" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_IssuanceOfConvertibleNotes" xlink:href="thcb-20210930.xsd#thcb_IssuanceOfConvertibleNotes"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfReconciliationOfTheBeginningAndEndingBalancesForAssetsAndLiabilitiesMeasuredAtFairValueOnARecurringBasisAbstract" xlink:to="thcb_IssuanceOfConvertibleNotes" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_ChangeInFairValueOfConvertibleNote" xlink:href="thcb-20210930.xsd#thcb_ChangeInFairValueOfConvertibleNote"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfReconciliationOfTheBeginningAndEndingBalancesForAssetsAndLiabilitiesMeasuredAtFairValueOnARecurringBasisAbstract" xlink:to="thcb_ChangeInFairValueOfConvertibleNote" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_ConversionAsOfBusinessCombinationinShares" xlink:href="thcb-20210930.xsd#thcb_ConversionAsOfBusinessCombinationinShares"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfReconciliationOfTheBeginningAndEndingBalancesForAssetsAndLiabilitiesMeasuredAtFairValueOnARecurringBasisAbstract" xlink:to="thcb_ConversionAsOfBusinessCombinationinShares" order="3" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/ScheduleofreconciliationofthebeginningandendingbalancesforLevel3warrantliabilityTable">
    <loc xlink:type="locator" xlink:label="thcb_ScheduleOfReconciliationOfTheBeginningAndEndingBalancesForLevel3WarrantLiabilityAbstract" xlink:href="thcb-20210930.xsd#thcb_ScheduleOfReconciliationOfTheBeginningAndEndingBalancesForLevel3WarrantLiabilityAbstract"/>
    <loc xlink:type="locator" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfReconciliationOfTheBeginningAndEndingBalancesForLevel3WarrantLiabilityAbstract" xlink:to="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_LiabilitiesFairValueAdjustment" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesFairValueAdjustment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfReconciliationOfTheBeginningAndEndingBalancesForLevel3WarrantLiabilityAbstract" xlink:to="us-gaap_LiabilitiesFairValueAdjustment" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfReconciliationOfTheBeginningAndEndingBalancesForLevel3WarrantLiabilityAbstract" xlink:to="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings" order="2" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/ScheduleofpreferredsharesissuedandoutstandingTable">
    <loc xlink:type="locator" xlink:label="us-gaap_PreferredUnitsLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredUnitsLineItems"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfPreferredUnitsTable" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfPreferredUnitsTable"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_PreferredUnitsLineItems" xlink:to="us-gaap_ScheduleOfPreferredUnitsTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_StatementClassOfStockAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementClassOfStockAxis"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfPreferredUnitsTable" xlink:to="us-gaap_StatementClassOfStockAxis" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ClassOfStockDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_StatementClassOfStockAxis" xlink:to="us-gaap_ClassOfStockDomain" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ClassOfStockDomain_0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_StatementClassOfStockAxis" xlink:to="us-gaap_ClassOfStockDomain_0" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_SeriesC1PreferredMember" xlink:href="thcb-20210930.xsd#thcb_SeriesC1PreferredMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="thcb_SeriesC1PreferredMember" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_SeriesC2PreferredMember" xlink:href="thcb-20210930.xsd#thcb_SeriesC2PreferredMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="thcb_SeriesC2PreferredMember" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_SeriesDPreferredStockMember" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SeriesDPreferredStockMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="us-gaap_SeriesDPreferredStockMember" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_TemporaryEquitySharesIssued" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TemporaryEquitySharesIssued"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PreferredUnitsLineItems" xlink:to="us-gaap_TemporaryEquitySharesIssued" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_ShareholdersDescription" xlink:href="thcb-20210930.xsd#thcb_ShareholdersDescription"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PreferredUnitsLineItems" xlink:to="thcb_ShareholdersDescription" order="2" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/ScheduleofbalanceofSeriesPreferredandredeemablenoncontrollinginterestsTable">
    <loc xlink:type="locator" xlink:label="us-gaap_RedeemableNoncontrollingInterestLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RedeemableNoncontrollingInterestLineItems"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RedeemableNoncontrollingInterestByLegalEntityTable" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RedeemableNoncontrollingInterestByLegalEntityTable"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_RedeemableNoncontrollingInterestLineItems" xlink:to="us-gaap_RedeemableNoncontrollingInterestByLegalEntityTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_StatementClassOfStockAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementClassOfStockAxis"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_RedeemableNoncontrollingInterestByLegalEntityTable" xlink:to="us-gaap_StatementClassOfStockAxis" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ClassOfStockDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_StatementClassOfStockAxis" xlink:to="us-gaap_ClassOfStockDomain" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ClassOfStockDomain_0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_StatementClassOfStockAxis" xlink:to="us-gaap_ClassOfStockDomain_0" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_SeriesC1PreferredMember" xlink:href="thcb-20210930.xsd#thcb_SeriesC1PreferredMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="thcb_SeriesC1PreferredMember" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_SeriesC2PreferredMember" xlink:href="thcb-20210930.xsd#thcb_SeriesC2PreferredMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="thcb_SeriesC2PreferredMember" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_SeriesD1PreferredMember" xlink:href="thcb-20210930.xsd#thcb_SeriesD1PreferredMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="thcb_SeriesD1PreferredMember" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_RedeemableNoncontrollingInterestsMember" xlink:href="thcb-20210930.xsd#thcb_RedeemableNoncontrollingInterestsMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="thcb_RedeemableNoncontrollingInterestsMember" order="3" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_EquityInstrumentCarryingAmount" xlink:href="thcb-20210930.xsd#thcb_EquityInstrumentCarryingAmount"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RedeemableNoncontrollingInterestLineItems" xlink:to="thcb_EquityInstrumentCarryingAmount" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_AccretionExpense" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccretionExpense"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RedeemableNoncontrollingInterestLineItems" xlink:to="us-gaap_AccretionExpense" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_ConversionAsOfMerger" xlink:href="thcb-20210930.xsd#thcb_ConversionAsOfMerger"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RedeemableNoncontrollingInterestLineItems" xlink:to="thcb_ConversionAsOfMerger" order="3" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/ScheduleofstockoptionactivityplanTable">
    <loc xlink:type="locator" xlink:label="thcb_SharebasedpaymentDetailsScheduleofstockoptionactivityplanLineItems" xlink:href="thcb-20210930.xsd#thcb_SharebasedpaymentDetailsScheduleofstockoptionactivityplanLineItems"/>
    <loc xlink:type="locator" xlink:label="thcb_SharebasedpaymentDetailsScheduleofstockoptionactivityplanTable" xlink:href="thcb-20210930.xsd#thcb_SharebasedpaymentDetailsScheduleofstockoptionactivityplanTable"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="thcb_SharebasedpaymentDetailsScheduleofstockoptionactivityplanLineItems" xlink:to="thcb_SharebasedpaymentDetailsScheduleofstockoptionactivityplanTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="srt_RangeAxis" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="thcb_SharebasedpaymentDetailsScheduleofstockoptionactivityplanTable" xlink:to="srt_RangeAxis" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="srt_RangeMember" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="srt_RangeAxis" xlink:to="srt_RangeMember" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="srt_RangeMember_0" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="srt_RangeAxis" xlink:to="srt_RangeMember_0" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="srt_MinimumMember" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MinimumMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_RangeMember" xlink:to="srt_MinimumMember" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="srt_MaximumMember" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_RangeMember" xlink:to="srt_MaximumMember" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingPeriodIncreaseDecreaseWeightedAverageExercisePrice" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingPeriodIncreaseDecreaseWeightedAverageExercisePrice"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SharebasedpaymentDetailsScheduleofstockoptionactivityplanLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingPeriodIncreaseDecreaseWeightedAverageExercisePrice" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionValuationMethodExpectedTerm1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionValuationMethodExpectedTerm1"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SharebasedpaymentDetailsScheduleofstockoptionactivityplanLineItems" xlink:to="us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionValuationMethodExpectedTerm1" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SharebasedpaymentDetailsScheduleofstockoptionactivityplanLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate" order="3" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_AverageCorrelationCoefficientOfPeerCompaniesinDollarsPerShare" xlink:href="thcb-20210930.xsd#thcb_AverageCorrelationCoefficientOfPeerCompaniesinDollarsPerShare"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SharebasedpaymentDetailsScheduleofstockoptionactivityplanLineItems" xlink:to="thcb_AverageCorrelationCoefficientOfPeerCompaniesinDollarsPerShare" order="4" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SharebasedpaymentDetailsScheduleofstockoptionactivityplanLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum" order="5" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionValuationMethodExpectedDividendRate" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionValuationMethodExpectedDividendRate"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SharebasedpaymentDetailsScheduleofstockoptionactivityplanLineItems" xlink:to="us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionValuationMethodExpectedDividendRate" order="6" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SharebasedpaymentDetailsScheduleofstockoptionactivityplanLineItems" xlink:to="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue" order="7" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/ScheduleofeffectivetimefairvalueofthestockoptionswasdeterminedusingtheBLMTable">
    <loc xlink:type="locator" xlink:label="thcb_ScheduleOfEffectiveTimeFairValueOfTheStockOptionsWasDeterminedUsingTheBlmAbstract" xlink:href="thcb-20210930.xsd#thcb_ScheduleOfEffectiveTimeFairValueOfTheStockOptionsWasDeterminedUsingTheBlmAbstract"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfEffectiveTimeFairValueOfTheStockOptionsWasDeterminedUsingTheBlmAbstract" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrices" xlink:href="thcb-20210930.xsd#thcb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrices"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfEffectiveTimeFairValueOfTheStockOptionsWasDeterminedUsingTheBlmAbstract" xlink:to="thcb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrices" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageGrantDateFairValueOutstanding" xlink:href="thcb-20210930.xsd#thcb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageGrantDateFairValueOutstanding"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfEffectiveTimeFairValueOfTheStockOptionsWasDeterminedUsingTheBlmAbstract" xlink:to="thcb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageGrantDateFairValueOutstanding" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualLifeOutstanding" xlink:href="thcb-20210930.xsd#thcb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualLifeOutstanding"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfEffectiveTimeFairValueOfTheStockOptionsWasDeterminedUsingTheBlmAbstract" xlink:to="thcb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualLifeOutstanding" order="3" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfEffectiveTimeFairValueOfTheStockOptionsWasDeterminedUsingTheBlmAbstract" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted" order="4" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceWeightedAverageExercisePriceGranted" xlink:href="thcb-20210930.xsd#thcb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceWeightedAverageExercisePriceGranted"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfEffectiveTimeFairValueOfTheStockOptionsWasDeterminedUsingTheBlmAbstract" xlink:to="thcb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceWeightedAverageExercisePriceGranted" order="5" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageGrantDateFairValueGranted" xlink:href="thcb-20210930.xsd#thcb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageGrantDateFairValueGranted"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfEffectiveTimeFairValueOfTheStockOptionsWasDeterminedUsingTheBlmAbstract" xlink:to="thcb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageGrantDateFairValueGranted" order="6" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualLifeGrantedinShares" xlink:href="thcb-20210930.xsd#thcb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualLifeGrantedinShares"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfEffectiveTimeFairValueOfTheStockOptionsWasDeterminedUsingTheBlmAbstract" xlink:to="thcb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualLifeGrantedinShares" order="7" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeitures" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeitures"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfEffectiveTimeFairValueOfTheStockOptionsWasDeterminedUsingTheBlmAbstract" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeitures" order="8" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrices" xlink:href="thcb-20210930.xsd#thcb_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrices"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfEffectiveTimeFairValueOfTheStockOptionsWasDeterminedUsingTheBlmAbstract" xlink:to="thcb_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrices" order="9" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageGrantDateFairValueForfeited" xlink:href="thcb-20210930.xsd#thcb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageGrantDateFairValueForfeited"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfEffectiveTimeFairValueOfTheStockOptionsWasDeterminedUsingTheBlmAbstract" xlink:to="thcb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageGrantDateFairValueForfeited" order="10" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualLifeForfeited" xlink:href="thcb-20210930.xsd#thcb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualLifeForfeited"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfEffectiveTimeFairValueOfTheStockOptionsWasDeterminedUsingTheBlmAbstract" xlink:to="thcb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualLifeForfeited" order="11" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualLifeOutstandingAtEnding" xlink:href="thcb-20210930.xsd#thcb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualLifeOutstandingAtEnding"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfEffectiveTimeFairValueOfTheStockOptionsWasDeterminedUsingTheBlmAbstract" xlink:to="thcb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualLifeOutstandingAtEnding" order="12" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOther" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOther"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfEffectiveTimeFairValueOfTheStockOptionsWasDeterminedUsingTheBlmAbstract" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOther" order="13" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceExpectedToVestAndExercisable" xlink:href="thcb-20210930.xsd#thcb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceExpectedToVestAndExercisable"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfEffectiveTimeFairValueOfTheStockOptionsWasDeterminedUsingTheBlmAbstract" xlink:to="thcb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceExpectedToVestAndExercisable" order="14" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageGrantDateFairValueExpectedToVestAndExercisable" xlink:href="thcb-20210930.xsd#thcb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageGrantDateFairValueExpectedToVestAndExercisable"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfEffectiveTimeFairValueOfTheStockOptionsWasDeterminedUsingTheBlmAbstract" xlink:to="thcb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageGrantDateFairValueExpectedToVestAndExercisable" order="15" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualLifeExpectedToVestAndExercisable" xlink:href="thcb-20210930.xsd#thcb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualLifeExpectedToVestAndExercisable"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfEffectiveTimeFairValueOfTheStockOptionsWasDeterminedUsingTheBlmAbstract" xlink:to="thcb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualLifeExpectedToVestAndExercisable" order="16" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/SchedulenonvestedsharesactivityTable">
    <loc xlink:type="locator" xlink:label="thcb_SharebasedpaymentDetailsSchedulenonvestedsharesactivityLineItems" xlink:href="thcb-20210930.xsd#thcb_SharebasedpaymentDetailsSchedulenonvestedsharesactivityLineItems"/>
    <loc xlink:type="locator" xlink:label="thcb_SharebasedpaymentDetailsSchedulenonvestedsharesactivityTable" xlink:href="thcb-20210930.xsd#thcb_SharebasedpaymentDetailsSchedulenonvestedsharesactivityTable"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="thcb_SharebasedpaymentDetailsSchedulenonvestedsharesactivityLineItems" xlink:to="thcb_SharebasedpaymentDetailsSchedulenonvestedsharesactivityTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_AwardTypeAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="thcb_SharebasedpaymentDetailsSchedulenonvestedsharesactivityTable" xlink:to="us-gaap_AwardTypeAxis" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_AwardTypeAxis" xlink:to="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_AwardTypeAxis" xlink:to="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_NonVestedShareUnitMember" xlink:href="thcb-20210930.xsd#thcb_NonVestedShareUnitMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="thcb_NonVestedShareUnitMember" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_NonVestedShareMember" xlink:href="thcb-20210930.xsd#thcb_NonVestedShareMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="thcb_NonVestedShareMember" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_SharesBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:href="thcb-20210930.xsd#thcb_SharesBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SharebasedpaymentDetailsSchedulenonvestedsharesactivityLineItems" xlink:to="thcb_SharesBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SharebasedpaymentDetailsSchedulenonvestedsharesactivityLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SharebasedpaymentDetailsSchedulenonvestedsharesactivityLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" order="3" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SharebasedpaymentDetailsSchedulenonvestedsharesactivityLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue" order="4" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_NumberOfNonvestedSharesTransferNonvestedShares" xlink:href="thcb-20210930.xsd#thcb_NumberOfNonvestedSharesTransferNonvestedShares"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SharebasedpaymentDetailsSchedulenonvestedsharesactivityLineItems" xlink:to="thcb_NumberOfNonvestedSharesTransferNonvestedShares" order="5" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SharebasedpaymentDetailsSchedulenonvestedsharesactivityLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" order="6" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_ShareBasedCompensationsArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:href="thcb-20210930.xsd#thcb_ShareBasedCompensationsArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SharebasedpaymentDetailsSchedulenonvestedsharesactivityLineItems" xlink:to="thcb_ShareBasedCompensationsArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" order="7" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_ShareBasedCompensationsArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:href="thcb-20210930.xsd#thcb_ShareBasedCompensationsArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SharebasedpaymentDetailsSchedulenonvestedsharesactivityLineItems" xlink:to="thcb_ShareBasedCompensationsArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" order="8" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SharebasedpaymentDetailsSchedulenonvestedsharesactivityLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross" order="9" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SharebasedpaymentDetailsSchedulenonvestedsharesactivityLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" order="10" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SharebasedpaymentDetailsSchedulenonvestedsharesactivityLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" order="11" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodIntrinsicValue" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodIntrinsicValue"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SharebasedpaymentDetailsSchedulenonvestedsharesactivityLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodIntrinsicValue" order="12" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/ScheduleofclassificationofstockbasedcompensationTable">
    <loc xlink:type="locator" xlink:label="thcb_ScheduleOfClassificationOfStockBasedCompensationAbstract" xlink:href="thcb-20210930.xsd#thcb_ScheduleOfClassificationOfStockBasedCompensationAbstract"/>
    <loc xlink:type="locator" xlink:label="thcb_SharebasedCompensationCostOfSales" xlink:href="thcb-20210930.xsd#thcb_SharebasedCompensationCostOfSales"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfClassificationOfStockBasedCompensationAbstract" xlink:to="thcb_SharebasedCompensationCostOfSales" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_OtherGeneralAndAdministrativeExpense" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherGeneralAndAdministrativeExpense"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfClassificationOfStockBasedCompensationAbstract" xlink:to="us-gaap_OtherGeneralAndAdministrativeExpense" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_OtherResearchAndDevelopmentExpense" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherResearchAndDevelopmentExpense"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfClassificationOfStockBasedCompensationAbstract" xlink:to="us-gaap_OtherResearchAndDevelopmentExpense" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_OtherSellingAndMarketingExpense" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherSellingAndMarketingExpense"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfClassificationOfStockBasedCompensationAbstract" xlink:to="us-gaap_OtherSellingAndMarketingExpense" order="3" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_SharebasedCompensationConstructionInProcess" xlink:href="thcb-20210930.xsd#thcb_SharebasedCompensationConstructionInProcess"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfClassificationOfStockBasedCompensationAbstract" xlink:to="thcb_SharebasedCompensationConstructionInProcess" order="4" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_StockBasedCompensationTotal" xlink:href="thcb-20210930.xsd#thcb_StockBasedCompensationTotal"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfClassificationOfStockBasedCompensationAbstract" xlink:to="thcb_StockBasedCompensationTotal" order="5" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/ScheduleofrelationshipwiththegroupTable">
    <loc xlink:type="locator" xlink:label="thcb_RelatedPartyBalancesandTransactionsDetailsScheduleofrelationshipwiththegroupLineItems" xlink:href="thcb-20210930.xsd#thcb_RelatedPartyBalancesandTransactionsDetailsScheduleofrelationshipwiththegroupLineItems"/>
    <loc xlink:type="locator" xlink:label="thcb_RelatedPartyBalancesandTransactionsDetailsScheduleofrelationshipwiththegroupTable" xlink:href="thcb-20210930.xsd#thcb_RelatedPartyBalancesandTransactionsDetailsScheduleofrelationshipwiththegroupTable"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="thcb_RelatedPartyBalancesandTransactionsDetailsScheduleofrelationshipwiththegroupLineItems" xlink:to="thcb_RelatedPartyBalancesandTransactionsDetailsScheduleofrelationshipwiththegroupTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="thcb_RelatedPartyBalancesandTransactionsDetailsScheduleofrelationshipwiththegroupTable" xlink:to="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:to="us-gaap_RelatedPartyDomain" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyDomain_0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:to="us-gaap_RelatedPartyDomain_0" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_OchemMember" xlink:href="thcb-20210930.xsd#thcb_OchemMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyDomain" xlink:to="thcb_OchemMember" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_OchemateMember" xlink:href="thcb-20210930.xsd#thcb_OchemateMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyDomain" xlink:to="thcb_OchemateMember" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_Descriptionofrelationshipwithrelatedparty" xlink:href="thcb-20210930.xsd#thcb_Descriptionofrelationshipwithrelatedparty"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_RelatedPartyBalancesandTransactionsDetailsScheduleofrelationshipwiththegroupLineItems" xlink:to="thcb_Descriptionofrelationshipwithrelatedparty" order="1" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/ScheduleofrelatedpartytransactionsTable">
    <loc xlink:type="locator" xlink:label="thcb_ScheduleOfRelatedPartyTransactionsAbstract" xlink:href="thcb-20210930.xsd#thcb_ScheduleOfRelatedPartyTransactionsAbstract"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RevenueFromRelatedParties" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueFromRelatedParties"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfRelatedPartyTransactionsAbstract" xlink:to="us-gaap_RevenueFromRelatedParties" order="0" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/ScheduleofcomputationofbasicanddilutednetlosspershareTable">
    <loc xlink:type="locator" xlink:label="thcb_ScheduleOfComputationOfBasicAndDilutedNetLossPerShareAbstract" xlink:href="thcb-20210930.xsd#thcb_ScheduleOfComputationOfBasicAndDilutedNetLossPerShareAbstract"/>
    <loc xlink:type="locator" xlink:label="thcb_NumeratorAbstract" xlink:href="thcb-20210930.xsd#thcb_NumeratorAbstract"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfComputationOfBasicAndDilutedNetLossPerShareAbstract" xlink:to="thcb_NumeratorAbstract" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_NetIncomeLossAvailableToCommonStockholders" xlink:href="thcb-20210930.xsd#thcb_NetIncomeLossAvailableToCommonStockholders"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_NumeratorAbstract" xlink:to="thcb_NetIncomeLossAvailableToCommonStockholders" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_DenominatorAbstract" xlink:href="thcb-20210930.xsd#thcb_DenominatorAbstract"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfComputationOfBasicAndDilutedNetLossPerShareAbstract" xlink:to="thcb_DenominatorAbstract" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_DenominatorAbstract" xlink:to="us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_DenominatorAbstract" xlink:to="us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare" order="1" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/ScheduleofsharesoutstandingwereexcludedfromthecalculationofdilutednetlossperordinaryshareTable">
    <loc xlink:type="locator" xlink:label="thcb_NetLossPerShareDetailsScheduleofsharesoutstandingwereexcludedfromthecalculationofdilutednetlossperordinaryshareLineItems" xlink:href="thcb-20210930.xsd#thcb_NetLossPerShareDetailsScheduleofsharesoutstandingwereexcludedfromthecalculationofdilutednetlossperordinaryshareLineItems"/>
    <loc xlink:type="locator" xlink:label="thcb_NetLossPerShareDetailsScheduleofsharesoutstandingwereexcludedfromthecalculationofdilutednetlossperordinaryshareTable" xlink:href="thcb-20210930.xsd#thcb_NetLossPerShareDetailsScheduleofsharesoutstandingwereexcludedfromthecalculationofdilutednetlossperordinaryshareTable"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="thcb_NetLossPerShareDetailsScheduleofsharesoutstandingwereexcludedfromthecalculationofdilutednetlossperordinaryshareLineItems" xlink:to="thcb_NetLossPerShareDetailsScheduleofsharesoutstandingwereexcludedfromthecalculationofdilutednetlossperordinaryshareTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_StatementClassOfStockAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementClassOfStockAxis"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="thcb_NetLossPerShareDetailsScheduleofsharesoutstandingwereexcludedfromthecalculationofdilutednetlossperordinaryshareTable" xlink:to="us-gaap_StatementClassOfStockAxis" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ClassOfStockDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_StatementClassOfStockAxis" xlink:to="us-gaap_ClassOfStockDomain" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ClassOfStockDomain_0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_StatementClassOfStockAxis" xlink:to="us-gaap_ClassOfStockDomain_0" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_SharesIssuableUponConversionOfSeriesB2PreferredMember" xlink:href="thcb-20210930.xsd#thcb_SharesIssuableUponConversionOfSeriesB2PreferredMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="thcb_SharesIssuableUponConversionOfSeriesB2PreferredMember" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_SharesIssuableUponConversionOfSeriesC1PreferredMember" xlink:href="thcb-20210930.xsd#thcb_SharesIssuableUponConversionOfSeriesC1PreferredMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="thcb_SharesIssuableUponConversionOfSeriesC1PreferredMember" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_SharesIssuableUponConversionOfSeriesC2PreferredMember" xlink:href="thcb-20210930.xsd#thcb_SharesIssuableUponConversionOfSeriesC2PreferredMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="thcb_SharesIssuableUponConversionOfSeriesC2PreferredMember" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_SharesIssuableUponConversionOfSeriesEELD1PreferredMember" xlink:href="thcb-20210930.xsd#thcb_SharesIssuableUponConversionOfSeriesEELD1PreferredMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="thcb_SharesIssuableUponConversionOfSeriesEELD1PreferredMember" order="3" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_SharesIssuableUponConversionOfSeriesD2PreferredMember" xlink:href="thcb-20210930.xsd#thcb_SharesIssuableUponConversionOfSeriesD2PreferredMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="thcb_SharesIssuableUponConversionOfSeriesD2PreferredMember" order="4" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_SharesIssuableUponExerciseOfShareOptions" xlink:href="thcb-20210930.xsd#thcb_SharesIssuableUponExerciseOfShareOptions"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_NetLossPerShareDetailsScheduleofsharesoutstandingwereexcludedfromthecalculationofdilutednetlossperordinaryshareLineItems" xlink:to="thcb_SharesIssuableUponExerciseOfShareOptions" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_SharesIssuableUponVestingOfNonvestedShares" xlink:href="thcb-20210930.xsd#thcb_SharesIssuableUponVestingOfNonvestedShares"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_NetLossPerShareDetailsScheduleofsharesoutstandingwereexcludedfromthecalculationofdilutednetlossperordinaryshareLineItems" xlink:to="thcb_SharesIssuableUponVestingOfNonvestedShares" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_SharesIssuableUponExerciseOfWarrants" xlink:href="thcb-20210930.xsd#thcb_SharesIssuableUponExerciseOfWarrants"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_NetLossPerShareDetailsScheduleofsharesoutstandingwereexcludedfromthecalculationofdilutednetlossperordinaryshareLineItems" xlink:to="thcb_SharesIssuableUponExerciseOfWarrants" order="3" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_SharesIssuableUponConversionOfSeries" xlink:href="thcb-20210930.xsd#thcb_SharesIssuableUponConversionOfSeries"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_NetLossPerShareDetailsScheduleofsharesoutstandingwereexcludedfromthecalculationofdilutednetlossperordinaryshareLineItems" xlink:to="thcb_SharesIssuableUponConversionOfSeries" order="4" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_SharesIssuableUponConversionOfNoncontrollingInterestsSubsidiary" xlink:href="thcb-20210930.xsd#thcb_SharesIssuableUponConversionOfNoncontrollingInterestsSubsidiary"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_NetLossPerShareDetailsScheduleofsharesoutstandingwereexcludedfromthecalculationofdilutednetlossperordinaryshareLineItems" xlink:to="thcb_SharesIssuableUponConversionOfNoncontrollingInterestsSubsidiary" order="5" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_SharesIssuableUponVestingOfEarnoutShares" xlink:href="thcb-20210930.xsd#thcb_SharesIssuableUponVestingOfEarnoutShares"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_NetLossPerShareDetailsScheduleofsharesoutstandingwereexcludedfromthecalculationofdilutednetlossperordinaryshareLineItems" xlink:to="thcb_SharesIssuableUponVestingOfEarnoutShares" order="6" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_SharesIssuableThatMayBeSubjectToCancellationinDollars" xlink:href="thcb-20210930.xsd#thcb_SharesIssuableThatMayBeSubjectToCancellationinDollars"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_NetLossPerShareDetailsScheduleofsharesoutstandingwereexcludedfromthecalculationofdilutednetlossperordinaryshareLineItems" xlink:to="thcb_SharesIssuableThatMayBeSubjectToCancellationinDollars" order="7" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/ScheduleoffutureminimumpaymentsunderleasecommitmentsTable">
    <loc xlink:type="locator" xlink:label="thcb_ScheduleOfFutureMinimumPaymentsUnderLeaseCommitmentsAbstract" xlink:href="thcb-20210930.xsd#thcb_ScheduleOfFutureMinimumPaymentsUnderLeaseCommitmentsAbstract"/>
    <loc xlink:type="locator" xlink:label="thcb_CapitalLeasesFutureMinimumPaymentsDuesSixMonths" xlink:href="thcb-20210930.xsd#thcb_CapitalLeasesFutureMinimumPaymentsDuesSixMonths"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfFutureMinimumPaymentsUnderLeaseCommitmentsAbstract" xlink:to="thcb_CapitalLeasesFutureMinimumPaymentsDuesSixMonths" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfFutureMinimumPaymentsUnderLeaseCommitmentsAbstract" xlink:to="us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfFutureMinimumPaymentsUnderLeaseCommitmentsAbstract" xlink:to="us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfFutureMinimumPaymentsUnderLeaseCommitmentsAbstract" xlink:to="us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears" order="3" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfFutureMinimumPaymentsUnderLeaseCommitmentsAbstract" xlink:to="us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears" order="4" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ScheduleOfFutureMinimumPaymentsUnderLeaseCommitmentsAbstract" xlink:to="us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears" order="5" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears" xlink:to="us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_CapitalLeasesFutureMinimumPaymentsDue" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsDue"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears" xlink:to="us-gaap_CapitalLeasesFutureMinimumPaymentsDue" order="1" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/SignificantAccountingPoliciesDetails">
    <loc xlink:type="locator" xlink:label="thcb_SignificantAccountingPoliciesDetailsLineItems" xlink:href="thcb-20210930.xsd#thcb_SignificantAccountingPoliciesDetailsLineItems"/>
    <loc xlink:type="locator" xlink:label="thcb_SignificantAccountingPoliciesDetailsTable" xlink:href="thcb-20210930.xsd#thcb_SignificantAccountingPoliciesDetailsTable"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="thcb_SignificantAccountingPoliciesDetailsLineItems" xlink:to="thcb_SignificantAccountingPoliciesDetailsTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="srt_StatementGeographicalAxis" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_StatementGeographicalAxis"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="thcb_SignificantAccountingPoliciesDetailsTable" xlink:to="srt_StatementGeographicalAxis" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="srt_SegmentGeographicalDomain" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_SegmentGeographicalDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="srt_StatementGeographicalAxis" xlink:to="srt_SegmentGeographicalDomain" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="srt_SegmentGeographicalDomain_0" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_SegmentGeographicalDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="srt_StatementGeographicalAxis" xlink:to="srt_SegmentGeographicalDomain_0" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="srt_AsiaPacificMember" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_AsiaPacificMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_SegmentGeographicalDomain" xlink:to="srt_AsiaPacificMember" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="srt_EuropeMember" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_EuropeMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_SegmentGeographicalDomain" xlink:to="srt_EuropeMember" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_OtherGeographicRegionsMember" xlink:href="thcb-20210930.xsd#thcb_OtherGeographicRegionsMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_SegmentGeographicalDomain" xlink:to="thcb_OtherGeographicRegionsMember" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_Revenues" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Revenues"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SignificantAccountingPoliciesDetailsLineItems" xlink:to="us-gaap_Revenues" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_RevenueRelatedToContractsBalance" xlink:href="thcb-20210930.xsd#thcb_RevenueRelatedToContractsBalance"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SignificantAccountingPoliciesDetailsLineItems" xlink:to="thcb_RevenueRelatedToContractsBalance" order="2" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/ReverseRecapitalizationDetails">
    <loc xlink:type="locator" xlink:label="thcb_ReverseRecapitalizationDetailsLineItems" xlink:href="thcb-20210930.xsd#thcb_ReverseRecapitalizationDetailsLineItems"/>
    <loc xlink:type="locator" xlink:label="thcb_ReverseRecapitalizationDetailsTable" xlink:href="thcb-20210930.xsd#thcb_ReverseRecapitalizationDetailsTable"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="thcb_ReverseRecapitalizationDetailsLineItems" xlink:to="thcb_ReverseRecapitalizationDetailsTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_SubsidiarySaleOfStockAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsidiarySaleOfStockAxis"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="thcb_ReverseRecapitalizationDetailsTable" xlink:to="us-gaap_SubsidiarySaleOfStockAxis" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_SaleOfStockNameOfTransactionDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_SubsidiarySaleOfStockAxis" xlink:to="us-gaap_SaleOfStockNameOfTransactionDomain" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_SaleOfStockNameOfTransactionDomain_0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_SubsidiarySaleOfStockAxis" xlink:to="us-gaap_SaleOfStockNameOfTransactionDomain_0" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_StatementEquityComponentsAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="thcb_ReverseRecapitalizationDetailsTable" xlink:to="us-gaap_StatementEquityComponentsAxis" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_EquityComponentDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_StatementEquityComponentsAxis" xlink:to="us-gaap_EquityComponentDomain" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_EquityComponentDomain_0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_StatementEquityComponentsAxis" xlink:to="us-gaap_EquityComponentDomain_0" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyTransactionAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyTransactionAxis"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="thcb_ReverseRecapitalizationDetailsTable" xlink:to="us-gaap_RelatedPartyTransactionAxis" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyTransactionDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_RelatedPartyTransactionAxis" xlink:to="us-gaap_RelatedPartyTransactionDomain" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyTransactionDomain_0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_RelatedPartyTransactionAxis" xlink:to="us-gaap_RelatedPartyTransactionDomain_0" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="srt_OwnershipAxis" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_OwnershipAxis"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="thcb_ReverseRecapitalizationDetailsTable" xlink:to="srt_OwnershipAxis" order="3" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="srt_OwnershipDomain" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_OwnershipDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="srt_OwnershipAxis" xlink:to="srt_OwnershipDomain" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="srt_OwnershipDomain_0" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_OwnershipDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="srt_OwnershipAxis" xlink:to="srt_OwnershipDomain_0" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_BridgeNotesMember" xlink:href="thcb-20210930.xsd#thcb_BridgeNotesMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyTransactionDomain" xlink:to="thcb_BridgeNotesMember" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_PIPEInvestorsMember" xlink:href="thcb-20210930.xsd#thcb_PIPEInvestorsMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyTransactionDomain" xlink:to="thcb_PIPEInvestorsMember" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_SponsorMember" xlink:href="thcb-20210930.xsd#thcb_SponsorMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyTransactionDomain" xlink:to="thcb_SponsorMember" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_CommonStockMember" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityComponentDomain" xlink:to="us-gaap_CommonStockMember" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_AdditionalPaidInCapitalMember" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityComponentDomain" xlink:to="us-gaap_AdditionalPaidInCapitalMember" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_MicrovastIncMember" xlink:href="thcb-20210930.xsd#thcb_MicrovastIncMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_OwnershipDomain" xlink:to="thcb_MicrovastIncMember" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_IPOMember" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IPOMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SaleOfStockNameOfTransactionDomain" xlink:to="us-gaap_IPOMember" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_OtherNotesPayable" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherNotesPayable"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ReverseRecapitalizationDetailsLineItems" xlink:to="us-gaap_OtherNotesPayable" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_SharesIssued" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharesIssued"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ReverseRecapitalizationDetailsLineItems" xlink:to="us-gaap_SharesIssued" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_PurchasePricePerShare" xlink:href="thcb-20210930.xsd#thcb_PurchasePricePerShare"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ReverseRecapitalizationDetailsLineItems" xlink:to="thcb_PurchasePricePerShare" order="3" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_AggregatePurchasePrice" xlink:href="thcb-20210930.xsd#thcb_AggregatePurchasePrice"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ReverseRecapitalizationDetailsLineItems" xlink:to="thcb_AggregatePurchasePrice" order="4" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_PartnersCapitalAccountUnitsSoldInPrivatePlacement" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PartnersCapitalAccountUnitsSoldInPrivatePlacement"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ReverseRecapitalizationDetailsLineItems" xlink:to="us-gaap_PartnersCapitalAccountUnitsSoldInPrivatePlacement" order="5" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ConvertibleNotesPayable" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConvertibleNotesPayable"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ReverseRecapitalizationDetailsLineItems" xlink:to="us-gaap_ConvertibleNotesPayable" order="6" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_PurchaseOfCommonStock" xlink:href="thcb-20210930.xsd#thcb_PurchaseOfCommonStock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ReverseRecapitalizationDetailsLineItems" xlink:to="thcb_PurchaseOfCommonStock" order="7" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_WarrantExercisePriceIncrease" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WarrantExercisePriceIncrease"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ReverseRecapitalizationDetailsLineItems" xlink:to="us-gaap_WarrantExercisePriceIncrease" order="8" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_DescriptionOfExchangeRatio" xlink:href="thcb-20210930.xsd#thcb_DescriptionOfExchangeRatio"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ReverseRecapitalizationDetailsLineItems" xlink:to="thcb_DescriptionOfExchangeRatio" order="9" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_AdditionalSharesOfCommonStock" xlink:href="thcb-20210930.xsd#thcb_AdditionalSharesOfCommonStock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ReverseRecapitalizationDetailsLineItems" xlink:to="thcb_AdditionalSharesOfCommonStock" order="10" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_WeightedAveragePricePerTheCommonStock" xlink:href="thcb-20210930.xsd#thcb_WeightedAveragePricePerTheCommonStock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ReverseRecapitalizationDetailsLineItems" xlink:to="thcb_WeightedAveragePricePerTheCommonStock" order="11" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_CommonStockReceivingAPerSharePrice" xlink:href="thcb-20210930.xsd#thcb_CommonStockReceivingAPerSharePrice"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ReverseRecapitalizationDetailsLineItems" xlink:to="thcb_CommonStockReceivingAPerSharePrice" order="12" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_FrameworkAgreementDescription" xlink:href="thcb-20210930.xsd#thcb_FrameworkAgreementDescription"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ReverseRecapitalizationDetailsLineItems" xlink:to="thcb_FrameworkAgreementDescription" order="13" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_SharesSubjectToCancellation" xlink:href="thcb-20210930.xsd#thcb_SharesSubjectToCancellation"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ReverseRecapitalizationDetailsLineItems" xlink:to="thcb_SharesSubjectToCancellation" order="14" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ProceedsFromContributionsFromParent" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromContributionsFromParent"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ReverseRecapitalizationDetailsLineItems" xlink:to="us-gaap_ProceedsFromContributionsFromParent" order="15" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ProceedsFromSaleOfTrustAssetsToPayExpenses" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromSaleOfTrustAssetsToPayExpenses"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ReverseRecapitalizationDetailsLineItems" xlink:to="us-gaap_ProceedsFromSaleOfTrustAssetsToPayExpenses" order="16" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_StockholdersEquityPeriodIncreaseDecrease" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquityPeriodIncreaseDecrease"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ReverseRecapitalizationDetailsLineItems" xlink:to="us-gaap_StockholdersEquityPeriodIncreaseDecrease" order="17" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_FinancingReceivableRevolving" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinancingReceivableRevolving"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ReverseRecapitalizationDetailsLineItems" xlink:to="us-gaap_FinancingReceivableRevolving" order="18" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_TransactionCosts" xlink:href="thcb-20210930.xsd#thcb_TransactionCosts"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ReverseRecapitalizationDetailsLineItems" xlink:to="thcb_TransactionCosts" order="19" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_CancellationConditionDescription" xlink:href="thcb-20210930.xsd#thcb_CancellationConditionDescription"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ReverseRecapitalizationDetailsLineItems" xlink:to="thcb_CancellationConditionDescription" order="20" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_EscrowShares" xlink:href="thcb-20210930.xsd#thcb_EscrowShares"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_ReverseRecapitalizationDetailsLineItems" xlink:to="thcb_EscrowShares" order="21" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/InventoriesNetDetails">
    <loc xlink:type="locator" xlink:label="us-gaap_InventoryDisclosureAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InventoryDisclosureAbstract"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InventoryWriteDown" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InventoryWriteDown"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InventoryDisclosureAbstract" xlink:to="us-gaap_InventoryWriteDown" order="0" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/ProductWarrantyDetails">
    <loc xlink:type="locator" xlink:label="us-gaap_ProductWarrantiesDisclosuresAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProductWarrantiesDisclosuresAbstract"/>
    <loc xlink:type="locator" xlink:label="thcb_EstimateAccrualAmount" xlink:href="thcb-20210930.xsd#thcb_EstimateAccrualAmount"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ProductWarrantiesDisclosuresAbstract" xlink:to="thcb_EstimateAccrualAmount" order="0" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/BankBorrowingsDetails">
    <loc xlink:type="locator" xlink:label="thcb_BankBorrowingsAbstract" xlink:href="thcb-20210930.xsd#thcb_BankBorrowingsAbstract"/>
    <loc xlink:type="locator" xlink:label="thcb_DebtInstrumentTermDescription" xlink:href="thcb-20210930.xsd#thcb_DebtInstrumentTermDescription"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_BankBorrowingsAbstract" xlink:to="thcb_DebtInstrumentTermDescription" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_DebtInstrumentFaceAmount1" xlink:href="thcb-20210930.xsd#thcb_DebtInstrumentFaceAmount1"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_BankBorrowingsAbstract" xlink:to="thcb_DebtInstrumentFaceAmount1" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_BankFacilityAgreementDescription" xlink:href="thcb-20210930.xsd#thcb_BankFacilityAgreementDescription"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_BankBorrowingsAbstract" xlink:to="thcb_BankFacilityAgreementDescription" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_GuaranteeToSecureCertainLoan" xlink:href="thcb-20210930.xsd#thcb_GuaranteeToSecureCertainLoan"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_BankBorrowingsAbstract" xlink:to="thcb_GuaranteeToSecureCertainLoan" order="3" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/BondsPayableDetails">
    <loc xlink:type="locator" xlink:label="thcb_BondsPayableDetailsLineItems" xlink:href="thcb-20210930.xsd#thcb_BondsPayableDetailsLineItems"/>
    <loc xlink:type="locator" xlink:label="thcb_BondsPayableDetailsTable" xlink:href="thcb-20210930.xsd#thcb_BondsPayableDetailsTable"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="thcb_BondsPayableDetailsLineItems" xlink:to="thcb_BondsPayableDetailsTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="srt_StatementScenarioAxis" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_StatementScenarioAxis"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="thcb_BondsPayableDetailsTable" xlink:to="srt_StatementScenarioAxis" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="srt_ScenarioUnspecifiedDomain" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ScenarioUnspecifiedDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="srt_StatementScenarioAxis" xlink:to="srt_ScenarioUnspecifiedDomain" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="srt_ScenarioUnspecifiedDomain_0" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ScenarioUnspecifiedDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="srt_StatementScenarioAxis" xlink:to="srt_ScenarioUnspecifiedDomain_0" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_StatementEquityComponentsAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="thcb_BondsPayableDetailsTable" xlink:to="us-gaap_StatementEquityComponentsAxis" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_EquityComponentDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_StatementEquityComponentsAxis" xlink:to="us-gaap_EquityComponentDomain" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_EquityComponentDomain_0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_StatementEquityComponentsAxis" xlink:to="us-gaap_EquityComponentDomain_0" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="thcb_BondsPayableDetailsTable" xlink:to="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:to="us-gaap_RelatedPartyDomain" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyDomain_0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:to="us-gaap_RelatedPartyDomain_0" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_HuzhouSaiyuanMember" xlink:href="thcb-20210930.xsd#thcb_HuzhouSaiyuanMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyDomain" xlink:to="thcb_HuzhouSaiyuanMember" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_ThirdPartyInvestorsMember" xlink:href="thcb-20210930.xsd#thcb_ThirdPartyInvestorsMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyDomain" xlink:to="thcb_ThirdPartyInvestorsMember" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_FirstTrancheMember" xlink:href="thcb-20210930.xsd#thcb_FirstTrancheMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyDomain" xlink:to="thcb_FirstTrancheMember" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_SecondTrancheMember" xlink:href="thcb-20210930.xsd#thcb_SecondTrancheMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyDomain" xlink:to="thcb_SecondTrancheMember" order="3" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="srt_ScenarioForecastMember" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ScenarioForecastMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_ScenarioUnspecifiedDomain" xlink:to="srt_ScenarioForecastMember" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_ConvertibleNotesMember" xlink:href="thcb-20210930.xsd#thcb_ConvertibleNotesMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityComponentDomain" xlink:to="thcb_ConvertibleNotesMember" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_BondLoan" xlink:href="thcb-20210930.xsd#thcb_BondLoan"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_BondsPayableDetailsLineItems" xlink:to="thcb_BondLoan" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_ConvertedFromTheExistingNoninterestbearingLoan" xlink:href="thcb-20210930.xsd#thcb_ConvertedFromTheExistingNoninterestbearingLoan"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_BondsPayableDetailsLineItems" xlink:to="thcb_ConvertedFromTheExistingNoninterestbearingLoan" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_EquityHoldingPledgedPercentage" xlink:href="thcb-20210930.xsd#thcb_EquityHoldingPledgedPercentage"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_BondsPayableDetailsLineItems" xlink:to="thcb_EquityHoldingPledgedPercentage" order="3" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_PreviousConvertedBond" xlink:href="thcb-20210930.xsd#thcb_PreviousConvertedBond"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_BondsPayableDetailsLineItems" xlink:to="thcb_PreviousConvertedBond" order="4" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_DebtInstrumentCovenantDescription" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentCovenantDescription"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_BondsPayableDetailsLineItems" xlink:to="us-gaap_DebtInstrumentCovenantDescription" order="5" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_DebtInstrumentFaceAmount" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_BondsPayableDetailsLineItems" xlink:to="us-gaap_DebtInstrumentFaceAmount" order="6" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_AggregateAmountOfBondLoan" xlink:href="thcb-20210930.xsd#thcb_AggregateAmountOfBondLoan"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_BondsPayableDetailsLineItems" xlink:to="thcb_AggregateAmountOfBondLoan" order="7" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_SubscribedByBondHolders" xlink:href="thcb-20210930.xsd#thcb_SubscribedByBondHolders"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_BondsPayableDetailsLineItems" xlink:to="thcb_SubscribedByBondHolders" order="8" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_BondsPayableDetailsLineItems" xlink:to="us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock" order="9" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_PurchaseAgreementToIssueConvertiblePromissoryNoteAmount" xlink:href="thcb-20210930.xsd#thcb_PurchaseAgreementToIssueConvertiblePromissoryNoteAmount"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_BondsPayableDetailsLineItems" xlink:to="thcb_PurchaseAgreementToIssueConvertiblePromissoryNoteAmount" order="10" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_InterestRate" xlink:href="thcb-20210930.xsd#thcb_InterestRate"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_BondsPayableDetailsLineItems" xlink:to="thcb_InterestRate" order="11" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ConvertibleNotesPayable" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConvertibleNotesPayable"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_BondsPayableDetailsLineItems" xlink:to="us-gaap_ConvertibleNotesPayable" order="12" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_DiscountedRate" xlink:href="thcb-20210930.xsd#thcb_DiscountedRate"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_BondsPayableDetailsLineItems" xlink:to="thcb_DiscountedRate" order="13" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_ChangesInFairValueGainLoss" xlink:href="thcb-20210930.xsd#thcb_ChangesInFairValueGainLoss"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_BondsPayableDetailsLineItems" xlink:to="thcb_ChangesInFairValueGainLoss" order="14" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ConversionOfStockSharesConverted1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConversionOfStockSharesConverted1"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_BondsPayableDetailsLineItems" xlink:to="us-gaap_ConversionOfStockSharesConverted1" order="15" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/WarrantsDetails">
    <loc xlink:type="locator" xlink:label="thcb_WarrantsDetailsLineItems" xlink:href="thcb-20210930.xsd#thcb_WarrantsDetailsLineItems"/>
    <loc xlink:type="locator" xlink:label="thcb_WarrantsDetailsTable" xlink:href="thcb-20210930.xsd#thcb_WarrantsDetailsTable"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="thcb_WarrantsDetailsLineItems" xlink:to="thcb_WarrantsDetailsTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_StatementEquityComponentsAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="thcb_WarrantsDetailsTable" xlink:to="us-gaap_StatementEquityComponentsAxis" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_EquityComponentDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_StatementEquityComponentsAxis" xlink:to="us-gaap_EquityComponentDomain" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_EquityComponentDomain_0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_StatementEquityComponentsAxis" xlink:to="us-gaap_EquityComponentDomain_0" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="thcb_WarrantsDetailsTable" xlink:to="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:to="us-gaap_RelatedPartyDomain" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyDomain_0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:to="us-gaap_RelatedPartyDomain_0" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_BusinessAcquisitionAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="thcb_WarrantsDetailsTable" xlink:to="us-gaap_BusinessAcquisitionAxis" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_BusinessAcquisitionAcquireeDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_BusinessAcquisitionAxis" xlink:to="us-gaap_BusinessAcquisitionAcquireeDomain" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_BusinessAcquisitionAcquireeDomain_0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_BusinessAcquisitionAxis" xlink:to="us-gaap_BusinessAcquisitionAcquireeDomain_0" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_EarlyBirdCapitalIncMember" xlink:href="thcb-20210930.xsd#thcb_EarlyBirdCapitalIncMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyDomain" xlink:to="thcb_EarlyBirdCapitalIncMember" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_WarrantMember" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WarrantMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityComponentDomain" xlink:to="us-gaap_WarrantMember" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_BusinessAcquisitionAcquireeDomain" xlink:to="us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_StockIssuedDuringPeriodSharesPurchaseOfAssets" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesPurchaseOfAssets"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_WarrantsDetailsLineItems" xlink:to="us-gaap_StockIssuedDuringPeriodSharesPurchaseOfAssets" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_StockIssuedDuringPeriodSharesStockSplits" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockSplits"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_WarrantsDetailsLineItems" xlink:to="us-gaap_StockIssuedDuringPeriodSharesStockSplits" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_SaleOfStockPricePerShare" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SaleOfStockPricePerShare"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_WarrantsDetailsLineItems" xlink:to="us-gaap_SaleOfStockPricePerShare" order="3" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_WarrantTerm" xlink:href="thcb-20210930.xsd#thcb_WarrantTerm"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_WarrantsDetailsLineItems" xlink:to="thcb_WarrantTerm" order="4" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ClassOfWarrantOrRightReasonForIssuingToNonemployees" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfWarrantOrRightReasonForIssuingToNonemployees"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_WarrantsDetailsLineItems" xlink:to="us-gaap_ClassOfWarrantOrRightReasonForIssuingToNonemployees" order="5" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_FairValueOfWarrants" xlink:href="thcb-20210930.xsd#thcb_FairValueOfWarrants"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_WarrantsDetailsLineItems" xlink:to="thcb_FairValueOfWarrants" order="6" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_TradingActivityGain" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TradingActivityGain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_WarrantsDetailsLineItems" xlink:to="us-gaap_TradingActivityGain" order="7" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/NoncontrollingInterestsDetails">
    <loc xlink:type="locator" xlink:label="thcb_NoncontrollingInterestsDetailsLineItems" xlink:href="thcb-20210930.xsd#thcb_NoncontrollingInterestsDetailsLineItems"/>
    <loc xlink:type="locator" xlink:label="thcb_NoncontrollingInterestsDetailsTable" xlink:href="thcb-20210930.xsd#thcb_NoncontrollingInterestsDetailsTable"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="thcb_NoncontrollingInterestsDetailsLineItems" xlink:to="thcb_NoncontrollingInterestsDetailsTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyTransactionAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyTransactionAxis"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="thcb_NoncontrollingInterestsDetailsTable" xlink:to="us-gaap_RelatedPartyTransactionAxis" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyTransactionDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_RelatedPartyTransactionAxis" xlink:to="us-gaap_RelatedPartyTransactionDomain" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyTransactionDomain_0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_RelatedPartyTransactionAxis" xlink:to="us-gaap_RelatedPartyTransactionDomain_0" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestorMember" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InvestorMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyTransactionDomain" xlink:to="us-gaap_InvestorMember" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_noncontrollingInterestPercentage" xlink:href="thcb-20210930.xsd#thcb_noncontrollingInterestPercentage"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_NoncontrollingInterestsDetailsLineItems" xlink:to="thcb_noncontrollingInterestPercentage" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ProceedsFromMinorityShareholders" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromMinorityShareholders"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_NoncontrollingInterestsDetailsLineItems" xlink:to="us-gaap_ProceedsFromMinorityShareholders" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_RedemptionOfNoncontrolingEquityInterestPercentage" xlink:href="thcb-20210930.xsd#thcb_RedemptionOfNoncontrolingEquityInterestPercentage"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_NoncontrollingInterestsDetailsLineItems" xlink:to="thcb_RedemptionOfNoncontrolingEquityInterestPercentage" order="3" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_SimpleAnnualInterest" xlink:href="thcb-20210930.xsd#thcb_SimpleAnnualInterest"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_NoncontrollingInterestsDetailsLineItems" xlink:to="thcb_SimpleAnnualInterest" order="4" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_PaymentsToExitingInvestors" xlink:href="thcb-20210930.xsd#thcb_PaymentsToExitingInvestors"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_NoncontrollingInterestsDetailsLineItems" xlink:to="thcb_PaymentsToExitingInvestors" order="5" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_PursuantToRemainingAmount" xlink:href="thcb-20210930.xsd#thcb_PursuantToRemainingAmount"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_NoncontrollingInterestsDetailsLineItems" xlink:to="thcb_PursuantToRemainingAmount" order="6" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_ConvertibleOfCommonShares" xlink:href="thcb-20210930.xsd#thcb_ConvertibleOfCommonShares"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_NoncontrollingInterestsDetailsLineItems" xlink:to="thcb_ConvertibleOfCommonShares" order="7" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/CommonStockDetails">
    <loc xlink:type="locator" xlink:label="thcb_CommonStockDetailsLineItems" xlink:href="thcb-20210930.xsd#thcb_CommonStockDetailsLineItems"/>
    <loc xlink:type="locator" xlink:label="thcb_CommonStockDetailsTable" xlink:href="thcb-20210930.xsd#thcb_CommonStockDetailsTable"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="thcb_CommonStockDetailsLineItems" xlink:to="thcb_CommonStockDetailsTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_StatementClassOfStockAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementClassOfStockAxis"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="thcb_CommonStockDetailsTable" xlink:to="us-gaap_StatementClassOfStockAxis" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ClassOfStockDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_StatementClassOfStockAxis" xlink:to="us-gaap_ClassOfStockDomain" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ClassOfStockDomain_0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_StatementClassOfStockAxis" xlink:to="us-gaap_ClassOfStockDomain_0" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="thcb_CommonStockDetailsTable" xlink:to="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:to="us-gaap_RelatedPartyDomain" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyDomain_0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:to="us-gaap_RelatedPartyDomain_0" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_MergerMember" xlink:href="thcb-20210930.xsd#thcb_MergerMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyDomain" xlink:to="thcb_MergerMember" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_CommonClassAMember" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonClassAMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="us-gaap_CommonClassAMember" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_ShareIssued" xlink:href="thcb-20210930.xsd#thcb_ShareIssued"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_CommonStockDetailsLineItems" xlink:to="thcb_ShareIssued" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_CommonStockSharesAuthorized" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockSharesAuthorized"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_CommonStockDetailsLineItems" xlink:to="us-gaap_CommonStockSharesAuthorized" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_CommonStockParOrStatedValuePerShare" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_CommonStockDetailsLineItems" xlink:to="us-gaap_CommonStockParOrStatedValuePerShare" order="3" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_DesignatedAsCommonStockShares" xlink:href="thcb-20210930.xsd#thcb_DesignatedAsCommonStockShares"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_CommonStockDetailsLineItems" xlink:to="thcb_DesignatedAsCommonStockShares" order="4" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ProceedsFromIssuanceOfRedeemableConvertiblePreferredStock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromIssuanceOfRedeemableConvertiblePreferredStock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_CommonStockDetailsLineItems" xlink:to="us-gaap_ProceedsFromIssuanceOfRedeemableConvertiblePreferredStock" order="5" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_SharesOutstandingPIPEInvestorsImmediatelyAfterMerger" xlink:href="thcb-20210930.xsd#thcb_SharesOutstandingPIPEInvestorsImmediatelyAfterMerger"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_CommonStockDetailsLineItems" xlink:to="thcb_SharesOutstandingPIPEInvestorsImmediatelyAfterMerger" order="6" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_MergerAgreementDescription" xlink:href="thcb-20210930.xsd#thcb_MergerAgreementDescription"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_CommonStockDetailsLineItems" xlink:to="thcb_MergerAgreementDescription" order="7" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_CommonStockShareIssued" xlink:href="thcb-20210930.xsd#thcb_CommonStockShareIssued"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_CommonStockDetailsLineItems" xlink:to="thcb_CommonStockShareIssued" order="8" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_CommonStockShareOutstanding" xlink:href="thcb-20210930.xsd#thcb_CommonStockShareOutstanding"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_CommonStockDetailsLineItems" xlink:to="thcb_CommonStockShareOutstanding" order="9" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/PreferredSharesDetails">
    <loc xlink:type="locator" xlink:label="us-gaap_DisclosureTextBlockSupplementAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisclosureTextBlockSupplementAbstract"/>
    <loc xlink:type="locator" xlink:label="thcb_ExchangeRatio" xlink:href="thcb-20210930.xsd#thcb_ExchangeRatio"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DisclosureTextBlockSupplementAbstract" xlink:to="thcb_ExchangeRatio" order="0" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/SharebasedpaymentDetails">
    <loc xlink:type="locator" xlink:label="thcb_SharebasedpaymentDetailsLineItems" xlink:href="thcb-20210930.xsd#thcb_SharebasedpaymentDetailsLineItems"/>
    <loc xlink:type="locator" xlink:label="thcb_SharebasedpaymentDetailsTable" xlink:href="thcb-20210930.xsd#thcb_SharebasedpaymentDetailsTable"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="thcb_SharebasedpaymentDetailsLineItems" xlink:to="thcb_SharebasedpaymentDetailsTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_StatementClassOfStockAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementClassOfStockAxis"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="thcb_SharebasedpaymentDetailsTable" xlink:to="us-gaap_StatementClassOfStockAxis" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ClassOfStockDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_StatementClassOfStockAxis" xlink:to="us-gaap_ClassOfStockDomain" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ClassOfStockDomain_0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_StatementClassOfStockAxis" xlink:to="us-gaap_ClassOfStockDomain_0" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_SubsidiarySaleOfStockAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsidiarySaleOfStockAxis"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="thcb_SharebasedpaymentDetailsTable" xlink:to="us-gaap_SubsidiarySaleOfStockAxis" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_SaleOfStockNameOfTransactionDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_SubsidiarySaleOfStockAxis" xlink:to="us-gaap_SaleOfStockNameOfTransactionDomain" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_SaleOfStockNameOfTransactionDomain_0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_SubsidiarySaleOfStockAxis" xlink:to="us-gaap_SaleOfStockNameOfTransactionDomain_0" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_AwardTypeAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="thcb_SharebasedpaymentDetailsTable" xlink:to="us-gaap_AwardTypeAxis" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_AwardTypeAxis" xlink:to="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_AwardTypeAxis" xlink:to="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RestrictedStockUnitsRSUMember" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="us-gaap_RestrictedStockUnitsRSUMember" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_PhantomShareUnitsPSUsMember" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PhantomShareUnitsPSUsMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="us-gaap_PhantomShareUnitsPSUsMember" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_SeriesB2PreferredMember" xlink:href="thcb-20210930.xsd#thcb_SeriesB2PreferredMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="thcb_SeriesB2PreferredMember" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_ShareOptionsMember" xlink:href="thcb-20210930.xsd#thcb_ShareOptionsMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SaleOfStockNameOfTransactionDomain" xlink:to="thcb_ShareOptionsMember" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_TotalIssuedAndOutstandingPercentage" xlink:href="thcb-20210930.xsd#thcb_TotalIssuedAndOutstandingPercentage"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SharebasedpaymentDetailsLineItems" xlink:to="thcb_TotalIssuedAndOutstandingPercentage" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_GrantedOptions" xlink:href="thcb-20210930.xsd#thcb_GrantedOptions"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SharebasedpaymentDetailsLineItems" xlink:to="thcb_GrantedOptions" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_GrantedOptionsNonvestedShares" xlink:href="thcb-20210930.xsd#thcb_GrantedOptionsNonvestedShares"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SharebasedpaymentDetailsLineItems" xlink:to="thcb_GrantedOptionsNonvestedShares" order="3" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_ConvertedOptions" xlink:href="thcb-20210930.xsd#thcb_ConvertedOptions"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SharebasedpaymentDetailsLineItems" xlink:to="thcb_ConvertedOptions" order="4" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_ConvertedOptionsNonvestedShares" xlink:href="thcb-20210930.xsd#thcb_ConvertedOptionsNonvestedShares"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SharebasedpaymentDetailsLineItems" xlink:to="thcb_ConvertedOptionsNonvestedShares" order="5" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_StandbyBondPurchaseCommitmentExpirationPeriod" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StandbyBondPurchaseCommitmentExpirationPeriod"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SharebasedpaymentDetailsLineItems" xlink:to="us-gaap_StandbyBondPurchaseCommitmentExpirationPeriod" order="6" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RevenueRemainingPerformanceObligationPercentage" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationPercentage"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SharebasedpaymentDetailsLineItems" xlink:to="us-gaap_RevenueRemainingPerformanceObligationPercentage" order="7" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_AggregateOfCommonStock" xlink:href="thcb-20210930.xsd#thcb_AggregateOfCommonStock"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SharebasedpaymentDetailsLineItems" xlink:to="thcb_AggregateOfCommonStock" order="8" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_AllocatedShareBasedCompensationExpense" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SharebasedpaymentDetailsLineItems" xlink:to="us-gaap_AllocatedShareBasedCompensationExpense" order="9" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_StockOptionPlanExpense" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockOptionPlanExpense"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SharebasedpaymentDetailsLineItems" xlink:to="us-gaap_StockOptionPlanExpense" order="10" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_NetAmountAtRiskByProductAndGuaranteeWeightedAveragePeriodRemaining1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetAmountAtRiskByProductAndGuaranteeWeightedAveragePeriodRemaining1"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SharebasedpaymentDetailsLineItems" xlink:to="us-gaap_NetAmountAtRiskByProductAndGuaranteeWeightedAveragePeriodRemaining1" order="11" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_AggregateIntrinsicValueOfTheShareOptions" xlink:href="thcb-20210930.xsd#thcb_AggregateIntrinsicValueOfTheShareOptions"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SharebasedpaymentDetailsLineItems" xlink:to="thcb_AggregateIntrinsicValueOfTheShareOptions" order="12" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_DeferredCompensationArrangementWithIndividualAllocatedShareBasedCompensationExpense" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredCompensationArrangementWithIndividualAllocatedShareBasedCompensationExpense"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SharebasedpaymentDetailsLineItems" xlink:to="us-gaap_DeferredCompensationArrangementWithIndividualAllocatedShareBasedCompensationExpense" order="13" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SharebasedpaymentDetailsLineItems" xlink:to="us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount" order="14" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SharebasedpaymentDetailsLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod" order="15" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SharebasedpaymentDetailsLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost" order="16" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_SharesIssued" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharesIssued"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SharebasedpaymentDetailsLineItems" xlink:to="us-gaap_SharesIssued" order="17" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_SaleOfStockPricePerShare" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SaleOfStockPricePerShare"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SharebasedpaymentDetailsLineItems" xlink:to="us-gaap_SaleOfStockPricePerShare" order="18" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SharebasedpaymentDetailsLineItems" xlink:to="us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends" order="19" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_LegallySharesIssuedAndOutstanding" xlink:href="thcb-20210930.xsd#thcb_LegallySharesIssuedAndOutstanding"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SharebasedpaymentDetailsLineItems" xlink:to="thcb_LegallySharesIssuedAndOutstanding" order="20" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_DepositLiability" xlink:href="thcb-20210930.xsd#thcb_DepositLiability"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SharebasedpaymentDetailsLineItems" xlink:to="thcb_DepositLiability" order="21" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_CommonStockHoweverShares" xlink:href="thcb-20210930.xsd#thcb_CommonStockHoweverShares"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SharebasedpaymentDetailsLineItems" xlink:to="thcb_CommonStockHoweverShares" order="22" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/MainlandChinaContributionPlanDetails">
    <loc xlink:type="locator" xlink:label="us-gaap_CompensationAndRetirementDisclosureAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract"/>
    <loc xlink:type="locator" xlink:label="us-gaap_EmployeeBenefitsAndShareBasedCompensation" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeBenefitsAndShareBasedCompensation"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_CompensationAndRetirementDisclosureAbstract" xlink:to="us-gaap_EmployeeBenefitsAndShareBasedCompensation" order="0" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/RelatedPartyBalancesandTransactionsDetails">
    <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyTransactionsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyTransactionsAbstract"/>
    <loc xlink:type="locator" xlink:label="thcb_LoansFromRelatedParties" xlink:href="thcb-20210930.xsd#thcb_LoansFromRelatedParties"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyTransactionsAbstract" xlink:to="thcb_LoansFromRelatedParties" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_OutstandingBalanceDueFromRelatedParty" xlink:href="thcb-20210930.xsd#thcb_OutstandingBalanceDueFromRelatedParty"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyTransactionsAbstract" xlink:to="thcb_OutstandingBalanceDueFromRelatedParty" order="1" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/CommitmentsandContingenciesDetails">
    <loc xlink:type="locator" xlink:label="thcb_CommitmentsandContingenciesDetailsLineItems" xlink:href="thcb-20210930.xsd#thcb_CommitmentsandContingenciesDetailsLineItems"/>
    <loc xlink:type="locator" xlink:label="thcb_CommitmentsandContingenciesDetailsTable" xlink:href="thcb-20210930.xsd#thcb_CommitmentsandContingenciesDetailsTable"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="thcb_CommitmentsandContingenciesDetailsLineItems" xlink:to="thcb_CommitmentsandContingenciesDetailsTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_FairValueByLiabilityClassAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByLiabilityClassAxis"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="thcb_CommitmentsandContingenciesDetailsTable" xlink:to="us-gaap_FairValueByLiabilityClassAxis" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_FairValueByLiabilityClassAxis" xlink:to="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_FairValueByLiabilityClassAxis" xlink:to="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_0" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_CapitalAdditionsMember" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CapitalAdditionsMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain" xlink:to="us-gaap_CapitalAdditionsMember" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_ShareIssued" xlink:href="thcb-20210930.xsd#thcb_ShareIssued"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_CommitmentsandContingenciesDetailsLineItems" xlink:to="thcb_ShareIssued" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_OtherEquityRemedies" xlink:href="thcb-20210930.xsd#thcb_OtherEquityRemedies"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_CommitmentsandContingenciesDetailsLineItems" xlink:to="thcb_OtherEquityRemedies" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_CapitalCommitments" xlink:href="thcb-20210930.xsd#thcb_CapitalCommitments"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_CommitmentsandContingenciesDetailsLineItems" xlink:to="thcb_CapitalCommitments" order="3" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/SubsequentEventsDetails">
    <loc xlink:type="locator" xlink:label="thcb_SubsequentEventsDetailsLineItems" xlink:href="thcb-20210930.xsd#thcb_SubsequentEventsDetailsLineItems"/>
    <loc xlink:type="locator" xlink:label="thcb_SubsequentEventsDetailsTable" xlink:href="thcb-20210930.xsd#thcb_SubsequentEventsDetailsTable"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="thcb_SubsequentEventsDetailsLineItems" xlink:to="thcb_SubsequentEventsDetailsTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_AwardTypeAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="thcb_SubsequentEventsDetailsTable" xlink:to="us-gaap_AwardTypeAxis" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_AwardTypeAxis" xlink:to="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_AwardTypeAxis" xlink:to="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RestrictedStockUnitsRSUMember" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="us-gaap_RestrictedStockUnitsRSUMember" order="0" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_PhantomShareUnitsPSUsMember" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PhantomShareUnitsPSUsMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="us-gaap_PhantomShareUnitsPSUsMember" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SubsequentEventsDetailsLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="thcb_ResearchAndDevelopmentExpenses" xlink:href="thcb-20210930.xsd#thcb_ResearchAndDevelopmentExpenses"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="thcb_SubsequentEventsDetailsLineItems" xlink:to="thcb_ResearchAndDevelopmentExpenses" order="2" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://thcb.com/role/DocumentAndEntityInformation">
    <loc xlink:type="locator" xlink:label="dei_DocumentInformationLineItems" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_DocumentInformationLineItems"/>
    <loc xlink:type="locator" xlink:label="dei_DocumentInformationTable" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_DocumentInformationTable"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_DocumentInformationTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="dei_EntityRegistrantName" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityRegistrantName"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityRegistrantName" order="1" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="dei_TradingSymbol" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_TradingSymbol"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_TradingSymbol" order="2" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="dei_DocumentType" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_DocumentType"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_DocumentType" order="3" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="dei_CurrentFiscalYearEndDate" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_CurrentFiscalYearEndDate"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_CurrentFiscalYearEndDate" order="4" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="dei_EntityCommonStockSharesOutstanding" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityCommonStockSharesOutstanding"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityCommonStockSharesOutstanding" order="5" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="dei_AmendmentFlag" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_AmendmentFlag"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_AmendmentFlag" order="6" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="dei_EntityCentralIndexKey" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityCentralIndexKey"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityCentralIndexKey" order="7" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="dei_EntityCurrentReportingStatus" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityCurrentReportingStatus"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityCurrentReportingStatus" order="8" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="dei_EntityFilerCategory" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityFilerCategory"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityFilerCategory" order="9" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="dei_DocumentPeriodEndDate" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_DocumentPeriodEndDate"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_DocumentPeriodEndDate" order="10" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="dei_DocumentFiscalYearFocus" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_DocumentFiscalYearFocus"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_DocumentFiscalYearFocus" order="11" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="dei_DocumentFiscalPeriodFocus" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_DocumentFiscalPeriodFocus"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_DocumentFiscalPeriodFocus" order="12" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="dei_EntitySmallBusiness" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntitySmallBusiness"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntitySmallBusiness" order="13" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="dei_EntityEmergingGrowthCompany" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityEmergingGrowthCompany"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityEmergingGrowthCompany" order="14" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="dei_EntityShellCompany" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityShellCompany"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityShellCompany" order="15" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="dei_EntityExTransitionPeriod" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityExTransitionPeriod"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityExTransitionPeriod" order="16" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="dei_DocumentQuarterlyReport" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_DocumentQuarterlyReport"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_DocumentQuarterlyReport" order="17" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="dei_DocumentTransitionReport" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_DocumentTransitionReport"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_DocumentTransitionReport" order="18" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="dei_EntityIncorporationStateCountryCode" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityIncorporationStateCountryCode"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityIncorporationStateCountryCode" order="19" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="dei_EntityFileNumber" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityFileNumber"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityFileNumber" order="20" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="dei_EntityTaxIdentificationNumber" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityTaxIdentificationNumber"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityTaxIdentificationNumber" order="21" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="dei_EntityAddressAddressLine1" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityAddressAddressLine1"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityAddressAddressLine1" order="22" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="dei_EntityAddressAddressLine2" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityAddressAddressLine2"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityAddressAddressLine2" order="23" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="dei_EntityAddressCityOrTown" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityAddressCityOrTown"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityAddressCityOrTown" order="24" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="dei_EntityAddressStateOrProvince" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityAddressStateOrProvince"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityAddressStateOrProvince" order="25" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="dei_EntityAddressPostalZipCode" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityAddressPostalZipCode"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityAddressPostalZipCode" order="26" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="dei_CityAreaCode" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_CityAreaCode"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_CityAreaCode" order="27" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="dei_LocalPhoneNumber" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_LocalPhoneNumber"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_LocalPhoneNumber" order="28" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="dei_Security12bTitle" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_Security12bTitle"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_Security12bTitle" order="29" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="dei_SecurityExchangeName" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_SecurityExchangeName"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_SecurityExchangeName" order="30" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="dei_EntityInteractiveDataCurrent" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityInteractiveDataCurrent"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityInteractiveDataCurrent" order="31" xbrldt:closed="true"/>
  </definitionLink>
</linkbase>
