你失败了一次又一次，为什么你脸上没有痛苦，只有快乐？

You failed again and again, why don't you have pain but happiness on your face?

youdao

我不能想象你为什么那么热，请把脸上的汗水擦去。

I can't imaging why you are so hot, please wipe out sweat on your face.

youdao

为什么茅屋里有不断的歌声？质朴的脸上常堆着麦子一样的灿烂的笑容？

Why singing always fills their thatched cottages and their faces are often covered in bright unaffected smile?

youdao

And this is why the humor-- why the damage is often a certain sort of damage involving things like embarrassment, sex, scatology, a banana peel, pie in the face, your pants fall down or something, where there's no real harm.

这就是为什么幽默-,所涉及的伤害通常都是,涉及尴尬，性，不雅语言，香蕉皮，摔到脸上的派，掉裤子之类的，这些情况没有造成真正伤害。

耶鲁公开课 - 心理学导论课程节选