Polyketides
聚酮
🗣️ 情景例句
Grandpa, when did Dad graduate from Michigan?
爷爷，爸爸是什么时候从Michigan毕业的？
You'd better go and see a doctor about that.
关于那个毛病，你最好去看医生。
How did you decide that product was safe?
你怎样决定产品是安全的呢？