It is a soldier's bound duty to execute orders.

执行命令是军人的天职。

youdao

I felt duty bound to help.

我觉得去帮忙是义不容辞的。

《柯林斯英汉双解大词典》

I felt duty-bound to help him.

我觉得帮助他责无旁贷。

《牛津词典》

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

And we have ratings agencies that are duty bound to value such debts on a transparent global benchmark.

BBC: The state of play in Athens

"This was a criminal allegation of the most serious nature which we were duty bound to investigate, " he said.

BBC: NEWS | UK | UK Politics | Key points: Cash-for-honours hearing

On the one hand, the CIA is duty bound to keep what it considers to be national security secrets.

NPR: A View from Inside the CIA