1
a tour of duty
常用不定冠词a，也可用his等限定词。
He completed a tour of duty in Afghanistan.
他在阿富汗完成了一次执勤期。
值勤期
tours of duty — plural of tour of duty
先理解核心含义，再看它在真实句子里的用法。
值勤期
a period of time spent on duty
He completed a tour of duty in Afghanistan.
他在阿富汗完成了一次执勤期。
在特定任务上度过的一段时间,尤其是海外任务
A period of time spent on a specific assignment, especially on an overseas mission.
After a six-month tour of duty, the peacekeepers returned home.
六个月的执勤期结束后，维和人员返回家乡。
She completed her two-year tour of duty at the embassy in Paris.
她在巴黎大使馆完成了一年两年的任期。
The hospital asks every doctor to do a one-year tour of duty in the rural branch.
医院要求每位医生在农村分部值勤一年。
常用不定冠词a，也可用his等限定词。
He completed a tour of duty in Afghanistan.
他在阿富汗完成了一次执勤期。
介词on表示处于执勤状态。
The soldiers are on a tour of duty overseas.
士兵们正在海外执行任务。
During his tour of duty, he learned many skills.
在他的值勤期间，他学到了很多技能。
Not this
He went on tour of duty in Afghanistan.
Use this
He went on a tour of duty in Afghanistan.
中文学习者常遗漏冠词'a'，因为中文没有冠词概念。在英语中，可数名词短语'tour of duty'前需要不定冠词'a'表示泛指一次值勤。
Not this
He is in his tour of duty now.
Use this
He is on his tour of duty now.
介词'in'误用。表示'在执行任务期间'应使用介词'on'，固定搭配'on a tour of duty'，而不是'in'。
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常用单数形式，如 a tour of duty
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from ECDICT, WIKTIONARY.