n.

1. 责任；义务；本分[C][U]
   It is our duty to defend our country.

   保卫国家是我们的义务。

2. 税[C][U]
   Customs duties are paid on imported goods.

   进口货物需交纳关税。

3. 职责；职务[P1]
   One of my duties is to file the letters.

   我的职责之一是将信件归档。

4. 敬意；恭顺
5. （机器的）功率；能率；负荷
6. （作物所需的）灌溉量

n.

1. a moral or legal obligation.
2. a task required as part of one's job.
   ▸ (duties) performance of prescribed church services by a priest or minister.
3. a payment levied on the import, export, manufacture, or sale of goods.
   ▸Brit. a payment levied on the transfer of property, for licences, and for the legal recognition of documents.
4. technical the measure of an engine's effectiveness in units of work done per unit of fuel.