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To be happy is to be able to become aware of oneself without fright.
The challenge in computer science is not just to solve problems, but to solve them in a way that is both efficient and elegant.
数学家是能在定理间找到类比的人;更好的数学家能在理论间看到类比;而最优秀的数学家能注意到类比之间的类比。