translation.en: So Robert Provine, who has done a lot of work on this, has pointed out that you are 30 times more likely to laugh if you are with somebody else than if you're on your own, and where you find most laughter is in social interactions like conversation.
translation.zh: 所以Robert Provine， 在这方面进行大量研究之后指出 你和别的人在一起的时候， 比你一个人单独呆着 发笑的概率高出30倍。 而几乎所有的笑 都发生在社交过程中， 比如与人交谈。