They may be born to perform certain things and as such they're duty bound to follow them.

他们天生的职责不同,所以他们的义务肯定会不同。

耶鲁公开课 - 心理学导论课程节选

Socrates tells us repeatedly that justice in the city consists of each member, each citizen fulfilling his task in the social division of labor, in the social hierarchy.

苏格拉底不断地告诉我们,城市正义的组合,是每一位成员，每一位公民都善尽,他们在社会劳动分工，或说是社会阶层中的职责。

耶鲁公开课 - 政治哲学导论课程节选