This time his father does not laugh.

VOA: special.2009.05.04

So, if a stranger slips on a banana peel and lands on his butt, I might laugh because I'm not overcome by compassion.

所以，看到陌生人踩蕉皮,摔个屁股着地，我会笑,因为我对他的同情不是很强烈。

耶鲁公开课 - 心理学导论课程节选

You can laugh for things you are not so sure with.

你不确定的事情就可以一笑置之。

普林斯顿公开课 - 人性课程节选

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