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
The cradle will fall,
摇篮会掉落
Draw water with a sieve.
竹篮子打水一场空。
It is only someone looking on from outside that can inject the dangerous thoughts.
只有外部的旁观者才能灌输危险的思想。