珍妮一看见他那张脸，就止住不笑了。

One look at his face and Jenny stopped laughing.

《牛津词典》

她试图强忍住不笑出来。

She made a valiant attempt not to laugh.

《牛津词典》

他好像从来都不笑。

He never seems to smile.

《牛津词典》

We laugh when there is incongruity between what we expect and what we actually--what actually happens unless the outcome is frightening."

当我们的期望和现实发生的事实,之间出现不一致时，我们就会笑,除非这种不一致引起恐惧”

耶鲁公开课 - 心理学导论课程节选

If he splits his head open and there's blood everywhere, I'm less likely to laugh unless I don't like him or something.

如果他摔个头破血流，我就笑不出，除非我很讨厌这个人。

耶鲁公开课 - 心理学导论课程节选

"Dificil, eh?" means " Difficult, isn't it?") Alright. I have to see this one more time.

很难不笑，不是吗）,我要再看一遍。

哈佛公开课 - 幸福课课程节选