Man acquires at birth, through heredity, a biological constitution which we must consider fixed and unalterable, including the natural urges which are characteristic of the human species.

人在出生时，通过遗传已得到了一种生物学上的素质，我们应当把它看作是固定的和不变的，这种素质包括那些作为人类特征的自然冲动。

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Fixed rates are like imposing a constitution on yourself to prevent bad behavior.

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