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

When monkeys get together to kill and eat somebody they make a kind of a laughing noise and chimpanzees laugh when they tickle each other.

猴子一起猎杀其他动物时,它们会发生出一种笑声,黑猩猩胳肢时也会笑。

耶鲁公开课 - 心理学导论课程节选

Now, if you were listing the parts of the body, you would list the teeth, you would list the lips, you would list the gums, you would list the tongue, but you wouldn't list the smile.

如果要罗列完成这个动作牵涉到的身体部位,你也许会列举牙齿,嘴唇,你会列举牙龈,舌头,但你不会列举出笑

耶鲁公开课 - 死亡课程节选