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