If slavery is natural, and if nature intends to distinguish the slave from the unfree, the free from the unfree, ? how can nature miss the mark?

如果奴役是自然的演变，而自然倾向于,将奴隶从不自由的人中区别出来，将自由从不自由中区别出来，自然如何会偏离正轨？

耶鲁公开课 - 政治哲学导论课程节选

Nature often misses the mark," he says.

自然常偏离正轨。

耶鲁公开课 - 政治哲学导论课程节选

Favoritism is human nature, says Mark Payleitner, a business career program instructor at Computer Systems Institute.

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Kulveer Ranger, the Mayor of London's transport adviser, met youngsters at Gunnersbury Triangle Nature Reserve to mark the scheme's first anniversary.

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The Nature paper, he said, "may mark the beginning of the end of this controversy" because it relies on DNA data from unrelated people, which is harder to dispute.

WSJ: Intelligence Changes Linked to Genes