There are many benefits to being happy. Happier people tend to be healthier, live longer and earn more. They also tend to volunteer more, be better at relationships and smile more of what psychologists call “Duchenne” or genuine smiles. Less well understood is why happiness is contagious.
幸福有许多好处。更幸福的人往往更健康、更长寿、挣得更多。他们通常也会从事更多的志愿工作、更善于处理人际关系、发出更多心理学家所说的“杜兴微笑”(Duchenne smile)，即真诚的微笑。让人不太理解的是，为什么幸福可以传染。
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