当你收到别人反过来的微笑时，你的精神会很好，同样微笑也会使其他人很高兴。
This will not only lift your spirits as you see a good many people smile back, but it will lift other people's as well.
她解释说：“微笑还能触发听众的镜像神经元，引导他们同样微笑以对。如果脸上没有笑意，一个人看上去就显得阴沉高冷。”
"It also sets off the mirror neurons in your listener, instructing them to smile back. Without the smile, an individual is often seen as grim or aloof, " she explained.
当彼得以同样的方式被问了几个问题后，他终于明白了，并露出了微笑。
After Peter was asked some more questions in the same way, he finally understood and smiled.
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