Ketones
n. 酮類（ketone的復(fù)數(shù)）
??? 情景例句
Uh, are you going to be busy this evening?
今晚忙嗎？
What is happening up there?
上面發(fā)生什么事情？
The order will be mailed to you next week.
下星期就寄給你們。