bio·de·gradeBrE/ˌbaɪəʊdɪˈɡreɪd/NAmE/ˌbaɪoʊdɪˈɡreɪd/verbpresent simple - I / you / we / theybiodegradeBrE/ˌbaɪəʊdɪˈɡreɪd/NAmE/ˌbaɪoʊdɪˈɡreɪd/present simple - he / she / itbiodegradesBrE/ˌbaɪəʊdɪˈɡreɪdz/NAmE/ˌbaɪoʊdɪˈɡreɪdz/past simplebiodegradedBrE/ˌbaɪəʊdɪˈɡreɪdɪd/NAmE/ˌbaɪoʊdɪˈɡreɪdɪd/past participlebiodegradedBrE/ˌbaɪəʊdɪˈɡreɪdɪd/NAmE/ˌbaɪoʊdɪˈɡreɪdɪd/ -ing formbiodegradingBrE/ˌbaɪəʊdɪˈɡreɪdɪŋ/NAmE/ˌbaɪoʊdɪˈɡreɪdɪŋ/[I](ofasubstanceorchemical物质或化学品) tochangebacktoaharmlessnaturalstatebytheactionofbacteria生物降解