Ethanal
乙醛
🗣️ 情景例句
I have worked hard at my major subject.
我对主修课特别用功。
It is my job to introduce the foreign guests who will be spending the week with us here.
我的责任是介绍这些将与我们共度这一周的外国客人们。
They aren't very busy!
他们不很忙吧！