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生活中只有两种悲剧:一个是没有得到我们想要的,另外一个是得到我们想要的。
The first step in liquidating a people is to erase its memory. Destroy its books, its culture, its history.
You are never too old to set another goal or to dream a new dream.
The concept of nondeterminism in computation is one of the most important ideas in computer science.