Biodegradation
生物降解
??? 情景例句
Yes, I have a terrible cold.
是的，我得了重感冒。
Her life was devoted to caring for the sick and needy.
她一生致力于照顧病人和窮人。
At last firemen have put out a big forest fire in California.
消防隊員們終于撲滅了加利福尼亞的一場森林大火。