tour of duty detail执勤期
a tour of duty值班;翻译;值日勤务
Ending tour of Duty下班了
N-COUNT（可数名词） A soldier's tour of duty is a period of time when the soldier is involved in a particular duty or stationed in a particular place such as a war zone. 勤务
...a Green Beret who served two tours of duty in Vietnam.
...一位两次在越南执行勤务的绿色贝雷帽成员。