Polyketides
聚酮
🗣️ 情景例句
I know.
我知道。
How long has he been with that company?
他在那家公司多久了？
These friendly dogs, which were first brought from Asia, were used as watchdogs even in Roman times.
那些最先从亚洲引进的狗，待人友好，早在罗马时代就给人当看门狗了。