The laugh is a lot like the "wow." It's that sound you make just because you're experiencing something, just because you're having a response to what's in front of you, something someone says.

这笑声很像“哇“这个字，是一种,因为正在经历某些事而发出的一种声音，作为你对面前发生的事或是，一些人说的话的反应。

耶鲁公开课 - 1945年后的美国小说课程节选

When you're in a group doing something terribly aggressive and you are not--you don't feel like you're at risk you might laugh and laughter is a signal to other members of your group as a signal of solidarity and what you're doing together.

当你在群体在做具有强烈攻击性的行为时,你不会觉得自己有危险,你会笑,你笑是向其他群体成员传达一个信号,你们团结一致，共同进退。

耶鲁公开课 - 心理学导论课程节选