Biodegradation
生物降解
🗣️ 情景例句
It is generally believed that Chinese are poor public speakers.
一般认为中国人不擅长公众演讲。
Coming events cast their shadows before them.
山雨欲来风满楼。
It is being repaired by a friend of my father's.
父亲的一个朋友正在修理这件乐器。