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

For Comus, nature has given us all of her riches and it's our duty, it's our obligation, to spend them, to consume them, and to luxuriate in nature's generosity.

科玛斯认为，自然赋予我们她所有的财富，我们有职责有义务去使用消费它们，自然如此慷慨大方，我们有义务去享用。

耶鲁公开课 - 弥尔顿课程节选