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In mathematics, as in life, the most profound discoveries often come from asking the simplest questions.
一个人对自己撒谎时撒谎最多。
愚蠢的人畏惧生病,却经常生病,明智的人居安思危,危险才不会降临。
自信是任何比赛的关键,但你必须用实力来支撑它。