The laugh track makes things a lot funnier because people laugh a lot more when they're in groups.

笑声音轨让影视内容更好笑,因为如果有一大群人在笑，人们会更容易笑。

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

So smiles and laughters are contagious.

笑和笑声是传染的。

哈佛公开课 - 幸福课课程节选

Children are particularly influenced by the contagiousness of laughter, but just in general, if you hear somebody laughing, like the kids you saw before, it's the sort of thing that could easily make you laugh.

孩子特别容易,受笑声的感染，但普遍来说，如果你听到有人笑，像你们刚才看到的小孩子，这样的事物很容易引你大笑。

耶鲁公开课 - 心理学导论课程节选