Jill didn't get the joke, but she laughed along to save face & hoped that no one would ask her to explain the punch line（笑点）.

吉尔没听懂那个笑话，但为了保全面子，她一直笑个不停，同时希望不会有人请她解释笑点在哪。

not just a pretty face

英文释义：(humorous) used to emphasize that you have particular skills or qualities

用来强调某人拥有特殊的才能或品质

‘I didn't know you could play the piano.’ ‘I'm not just a pretty face, you know!’

“我都不知道你会弹钢琴”“你知道的，我可不一般”。

somebody’s face is like thunder/somebody has a face like thunder

英文释义：somebody looks very angry

用来形容某人非常生气。

Mr Hibbs came in with a face like thunder.

海布斯先生怒气冲冲地走了进来。

feed your face

英文释义：to eat a lot of food or too much food

表示大吃一顿

have the face to do something

英文释义(British English, informal) to do something that other people think is rude or shows a lack of respect, without feeling embarrassed or ashamed

厚颜无耻地做某事；居然有脸做某事，中文里也有类似表达。

I don't know how you have the face to complain after everything they've done for you!

他们为你做了那么多，你怎么还有脸抱怨!

have egg on your face

英文释义：(informal) to be made to look stupid

丢脸；出丑；令人尴尬。等同于be left with egg on your face

They were left with egg on their faces when only ten people showed up.

只有十个人来了，他们感到很尴尬。