We have a moral obligation to protect the environment.

我们有道义责任保护环境。

《牛津词典》

When teachers assign homework, students usually feel an obligation to do it.

老师布置家庭作业时，学生们通常感觉做作业是一种义务。

《柯林斯英汉双解大词典》

South Carolina claimed the power to exempt its citizens from the obligation to obey federal law.

南卡罗来纳州宣称有权使其公民免除遵守联邦法律的义务。

《柯林斯英汉双解大词典》

So every generation of Israel is to view itself as standing at the sacred mountain to conclude a covenant with God, and that decisive moment has to be made ever-present. That's a process that's facilitated by the obligation to study, to study the laws, to recite them daily, to teach them to your children: these are instructions that are contained in Deuteronomy.

那么每一代以色列人都将自己看做站在圣山上,与上帝立约的人，于是那个决定性的时刻,被变为了恒久的场景这是通过学习，学习律法,而达成的过程，每天背诵它们，把它们交给你的孩子们：这是申命记中,包含的指示。

耶鲁公开课 - 旧约导论课程节选

Of two pleasures, if there be one to which all or almost all who have experience of both give a decided preference, irrespective of any feeling of moral obligation to prefer it -- in other words, no outside, no independent standard -- then, that is the more desirable pleasure."

这两种快乐中，如果所有或几乎所有,两种都体验过的人，都更偏好其中一种，而且并不是出于任何道德责任-,换句话说，没有外界的，独立的标准影响-,那么该快乐就是更令人满意的“

耶鲁公开课 - 公正课程节选

And we have an obligation -- both parties -- to tackle this issue in a serious way.

WHITEHOUSE: President Obama Holds News Conference

This is our obligation -- not simply to bear witness, but to act.

WHITEHOUSE: Our Top Stories

McWILLIAMS: We got to understand one factor there, and that is, you know, we have an obligation - to maintain good order and discipline.

NPR: Checking In on Fort Carson, Part II