想要改变世界？试着微笑吧。
微笑能够使你和身边人进入到一种更加积极的情绪当中，甚至在你并不很想微笑时也会奏效。如果你感到沮丧，那么就试着保持三十秒钟的微笑吧，看看这样会有什么效果。
It even works when you don't feel much like smiling. Just try forcing a smile for 30 seconds if you are feeling a bit negative and see what happens.
因为你不知道哪个人（些）是谁，所以试着给每一个你遇到的人一个温暖的微笑吧。
Since you don't know who that person is, try giving everyone you meet a warm smile;
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