He felt he would be failing in his duty if he did not report it.

他认为他如果不报告就是失职。

《牛津词典》

In addition to these arrangements, extra ambulances will be on duty until midnight.

除了这些安排以外，另增救护车值班至午夜。

《牛津词典》

Nevertheless one is forced to recognize that in times of financial difficulty the university has a duty to decide where money can be saved.

然而，人们不得不承认，在经济困难时期，大学有责任决定在何处省钱。

youdao

It will house 8,000 people in tents. Fifty security guards will be on duty around the clock.

VOA: standard.2010.03.29

It doesn't say that in the state law but that would be inferred as a duty.

州法中并没有明确规定,但可以从他们的义务中推测出来

耶鲁公开课 - 金融市场课程节选

U.S.Army Sergeant Jeremy Tormala, on his second tour of duty in Iraq, thought the elections gave a good indication that Iraqi forces will be up to the task.

VOA: standard.2010.03.08

There may be conflict in duty when outsourced professionals are also CPAs or attorneys, for example.

FORBES: Mind On The Money: The Dodd-Frank Whistleblower Provisions

In today's tough economic climate, we would be failing in our duty to the taxpaying public if we had allowed its excesses, which saw some employees walking away with packages worth more than six years' pay, to continue.

BBC: Civil servants' redundancy offer revised

"We should be failing in our duty if we didn't work with our allies to deal with the problem where it starts, " he said.

BBC: Barack Obama briefs Karzai on new US strategy