关于duty的用法与搭配结构
  1. 表示有责任或义务做某事,其后可接 to do sth 或 of doing sth。如:
  A man has a duty to earn money for his family. 男人有挣钱养家的责任。
  Every citizen has the duty of defending his country. 每个公民都有保卫祖国的责任。
  2. 表示责任义务,视含义的具体或抽象可用作可数或不可数名词。如:
  Everyone has a duty to his country. 为国效劳,人人有责。
  He did it out of a sense of duty. 他做此事是出于一种责任感。
  表示作为工作一部分的职责或职务等,通常用复数形式。如:
  Dont forget your duties as a soldier. 不要忘记你作为一名战士的职责。
  Your duties include checking the post and distributing it. 你的职责是检查和发送邮件。
  3. 比较 do duty for sb(代替某人)与 do duty for sth(充当或当作某物用)。如:defending
  He did duty for a sick comrade. 他接替一位患病的同志工作。
  An old wooden box did duty for a table. 一个旧木箱子被当作桌子用。
  4. 用于 on (off) duty, 意为值(值)班当(不当)班等(注意不用冠词)。如:
  He goes on duty at 8 am and comes off duty at 5 pm. 他上午8点上班下午5点下班。
  The rule is that someone must be on duty at all times. 按照规定,任何时候均需有人值班。

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