N-COUNT 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。
The soldiers all used to do a six-month tour of duty in Northern Ireland.
士兵过去都要在北爱尔兰服役六个月。
In 1968, he received orders for his second tour of duty to Vietnam.
1968年，他接到第二个调令去了越南。
That is our sacred trust with all who serve -and it doesn't end when their tour of duty does.
这是我们对服役人员的神圣职责，他们的付出不息，我们的职责不断。
He is believed to have had serious reservations about the upcoming tour of duty in a Muslim nation.
VOA: standard.2009.11.10
U.S.Army Sergeant Jeremy Tormala, on his second tour of duty in Iraq, thought the elections gave a good indication that Iraqi forces will be up to the task.
VOA: standard.2010.03.08
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