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
I heard a lot of shouting, what's up?
我听见很多喊声，出了什么事了？
Tom's been feeling blue ever since his divorce.
自离婚以来，汤姆一直很忧郁。
I beg your pardon?Who's climbing the tree?
你说什么？谁在爬树？