笑就笑，想哭就哭，压抑自己是没有意义的。

Laugh or cry as you like, and it's meaningless to oppress yourself.

youdao

微波炉先是楞了一下，然后转过头对它后面的电冰箱说：‘你要笑就笑，嘴巴张那么大干吗？！

Microwave oven first is stared blankly once, then became overdo to say to the refrigerator of its behinds:'You want to smile and then smile, is the mouth piece dry so and greatly?

youdao

那你就看着我，我笑的时候你就笑。

Then just look at me, and laugh when I laugh.

youdao

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

They say it, so that we don't have to and we laugh our heads off.

他们说出来了，我们就不用说了，我们只管笑掉大牙。

街上的售票员 - SpeakingMax英语口语达人

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