decompose
verb [ I or T ] uk/ˌdiː.kəmˈpəʊz/ us/ˌdiː.kəmˈpoʊz/
（使）腐化，（使）腐烂
to decay, or to cause something to decay
The body must have been decomposing for several weeks. 那具尸体肯定已经腐烂好几个星期了。
chemistry specialized（使）分解，（使）分化
to break, or to break something, into smaller parts
Microbes decompose organic waste into a mixture of methane and carbon dioxide. 微生物把有机废物分解为一种甲烷和二氧化碳的混合物。