and it's contagious. That's another interesting thing about it.

还具有感染性这是关于笑的另一个有趣性质
One of the great discoveries in television and movies

电视和电影里最伟大的发现之一就是
was the invention of the laugh track. The laugh track makes things a lot funnier

在表演节目里加入笑声音轨这背景笑声能让人觉得更搞笑
because people laugh a lot more when they're in groups.

因为在群体中人们更容易笑
The rim shot after a comic remark is an attempt to simulate--

笑话一讲完后面就会出现
sort of a pre-technological attempt to simulate the sound of laughter.

某种用先进技术模拟的笑声
Children are particularly influenced by the contagiousness of laughter,

孩子们特别容易受到笑声的感染
but just in general, if you hear somebody laughing,

通常如果你听到有人大笑
like the kids you saw before,

就像你之前见到的小孩
it's the sort of thing that could easily make you laugh.

很容易就令你也笑了
Other primates do it to some extent and then it's interesting when they do it.

其他灵长目动物某种情况下也一样它们什么时候笑很有趣
Monkeys laugh when they attack.

猴子攻击时会笑