Mother hen:

妈妈的母鸡 ×

关心他人冷暖的人；婆婆妈妈的人 √

例句：

Li is like a mother hen, catering to the students' every need.

Li就像个妈妈一样，满足学生们的各种需求。

User:

用户 ×

瘾君子 √

例句：

I want to stop being a user，but I can't do it myself.

我想戒毒，可是我自己没法戒。

Catch-22:

抓住22 ×

难以逾越的障碍，无法摆脱的困境 √

例句：

There was nothing I could do, it was a catch-22.

我无计可施，真是寸步难行。