We have a duty to uphold the law.

维护法律是我们的责任。

《牛津词典》

We have a duty to care for the refugees.

我们有义务关怀这些难民。

《牛津词典》

The Church has a duty to condemn violence.

基督教会有义务谴责暴力。

《牛津词典》

The publisher thought the press had a duty to place itself into stories to right wrongs where it could.

VOA: special.2009.08.28

Some others If I might have a right to X, do you have a duty to fulfill that for me?

其他的像如果我有某项权利，你有没有义务帮我实现？

普林斯顿公开课 - 人性课程节选

because you read the Bill of Rights, for example, The Declaration of Independence, citizens have a duty to put a new government if it is not serving well the people.

举个例子，如果你读《人权法案》,或者《独立宣言》,如果政府不够尽责,公民有权支持一个新的政府。

麻省理工公开课 - 媒体、教育、市场课程节选

"It's a duty to our patients to talk about it as something to consider, " he says.

WSJ: More Doctors Broach Subject of Women's Age and Fertility

He accused us of trying to scare trustees into believing they had such a duty.

FORBES: The Long Overdue Florida Public Pension Clean-Up (November 21, 2007 )

Half a dozen Conservative MPs had signed an Early Day Motion calling for a duty freeze.

BBC: Chancellor responds to pressure over fuel duty