translation.en: Everybody underestimates how often they laugh, and you're doing something, when you laugh with people, that's actually letting you access a really ancient evolutionary system that mammals have evolved to make and maintain social bonds, and clearly to regulate emotions, to make ourselves feel better.
translation.zh: 每个人都低估了自己笑得有多频繁， 并且，当你和别人一起笑时， 你做的那些事情， 真的让你进入到了古老的进化系统中 那是所有哺乳动物演化来 制造和维持社会纽带的系统， 它还能明显地调节情绪， 让我们感到好受一些。