4-f
n. [美国英语]；选征兵役制中不及格者免除兵役(者)(指身体、心理、品德等不适于服兵役)的分类
🗣️ 情景例句
You'd better watch your step or you'll get into trouble again.
你最好留点儿神， 免得再惹麻烦。
I would like to talk with someone in charge.
我想请你们负责人讲话。
Yes, Mr. Wu.
好的，吴先生。