Dmk
[医][=demethylketene]脱甲基乙烯酮
🗣️ 情景例句
I have worked hard at my major subject.
我对主修课特别用功。
I ask him to stay at home.
我要求他待在家里。
We'll have to cancel if we don't get that order soon.
如果不能很快拿到货，我们只有取消啦。