biodegrade
verb [ I ] uk/ˌbaɪ.əʊ.dɪˈɡreɪd/ us/ˌbaɪ.oʊ.dɪˈɡreɪd/
生物降解,生物分解
to decay naturally and in a way that is not harmful
Some plastics are designed to biodegrade when their useful life is over. 有些塑料被设计为过了有效使用期就可以生物降解。
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