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A smile is often the key thing. One is paid with a smile. One is rewarded with a smile. One is brightened by a smile. And the quality of a smile can make one die.

微笑往往是关键。一个人的报酬是微笑。一个人得到的回报是微笑。一个人因微笑而容光焕发。微笑的品质可以让一个人死去。

— Antoine de Saint-Exupéry 安托万·德·圣-埃克苏佩里