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你停止尝试的那一刻,就是你开始死亡的那一刻。
要成为一个好的数学家,你需要既有直觉又有严谨。
I don't sing because I'm happy; I'm happy because I sing.
The American farmer is the only man in our economy who has to buy everything he buys at retail, sell everything he sells at wholesale, and pay the freight both ways.
思想的存在是为了服务行动,而不仅仅是反映现实。