名词

1. 职务;义务
Duty is work that you have to do for your job.

2. 职责;任务;本职工作
Your duties are tasks which you have to do because they are part of your job.

3. 责任;本分
If you say that something is your duty, you believe that you ought to do it because it is your responsibility.

4. 税
Duties are taxes which you pay to the government on goods that you buy.

5. 下班/上班;不值班/值班
If someone such as a policeman or a nurse is off duty, they are not working. If someone is on duty, they are working.