All the time these two factors affect each other, that is why smiling when sad makes you happier and it is why you laugh when you find something funny.
这两项因素一直都是互相影响的，这就是为什么难受的时候微笑会使你开心些，同样也说明了为什么当发现有趣的事情时你会大笑。
All the time these two factors affect each other, that is why smiling when sad makes you happier and it is why you laugh when you find something funny.
这两项因素一直都是互相影响的，这就是为什么难受的时候微笑会使你开心些，同样也说明了为什么当发现有趣的事情时你会大笑。
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