It's because man alone has the faculty of speech and the ability to distinguish good from bad,and right from wrong.

这是因为人类有演讲的才能,也有能力,明辨是非,分辨正误

耶鲁公开课 - 古希腊历史简介课程节选

We are political animals, he says, because participation in the life of the city is necessary for the achievement of human excellence, for the achievement of our well-being.

他说，我们是政治动物，因为参与城市生活,才能达致,人类卓越，也才能达致我们的福祉。

耶鲁公开课 - 政治哲学导论课程节选