But I can't understand, why you laugh, though you cry.
但我不明白，为什么你笑，尽管你哭。
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。
After walking onto the stage, she began to speak, "I know you have been laughing behind my back for years. Today I have a great chance to make you all laugh in front of me. That's why I am here."
走上舞台后，她开口说：“我知道你们在背后嘲笑我好多年了。今天我有一个很好的机会让你们在我面前笑。这就是我在这里的原因。”
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