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

He feels duty-bound to participate materially in this political controversy rather than merely remaining in his studious retirement, however pleasant that is, at his father's house.

他觉得自己有责任积极参与到,这场政治争端中来,而不是仅仅拘泥于晚年的学究生活，不管那种生活是多么的惬意。

耶鲁公开课 - 弥尔顿课程节选