Mr Rogers will do duty for me while I'm away next week.

下周我外出时，罗杰斯先生代我履行职务。

In an emergency a tightly tied woman's stocking can do duty for a car's fan belt so that you can drive it to a garage.

出现紧急情况时，把女子长袜系紧后可以充作汽车鼓风机皮带，这样就可以将汽车开到汽车修理厂去。

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

如果我有权利，你有义务为我实现它吗？

For those of us living between both Chinese and American cultures, it’s our duty to do the same.

对我们这些生活在中美两种文化之间的人来说，我们有责任来做同样的事情。

They do their further duty by taking care of their grandchildren, paying e-bills, giving the clothes for laundry etc.

但他们从不向我们明确地说出来。他们会尽更多的义务，照顾利，子孙女，付电子账单的费用，把衣服拿去洗衣店，等等。