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The mathematician does not study pure mathematics because it is useful; he studies it because he delights in it and he delights in it because it is beautiful.
一本书可以是一个朋友、一位老师和通往另一个世界的门。
Every man has a right to his opinion, but no man has a right to be wrong in his facts.
Mathematics is not a spectator sport.
要得到饼干,就得冒险。
预测未来的最好方法就是创造它。