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Since natural selection requires a function to select, an irreducibly complex biological system, if there is such a thing, would have to arise as an integrated unit for natural selection to have anything to act on.
既然自然选择需要一个功能来选择，一个不可还原的复杂的生物系统，如果有这样一个东西，将不得不作为一个整体出现，自然选择有任何行动。