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我认为质数就像生活。它们非常合乎逻辑,但你永远无法弄清楚其中的规则,即使你花所有时间去思考它们。
The founders of a new colony, whatever Utopia of human virtue and happiness they might originally project, have invariably recognized it among their earliest practical necessities to allot a portion of the virgin soil as a cemetery, and another portion as the site of a prison.