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
Robbie, Robbie, remember me?
Robbie， Robbie，记得我吗？
What did you like best about the movie?
你最喜欢这电影的什么？
This model's less expensive than that one.
这种型号比那种要便宜些。