tour of duty

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General Craddock will end his tour of duty later this year.
克拉多克今年晚些时候将结束他在北约的任务。
As a junior naval officer, while on a short tour of duty at sea, he’d got hooked on the Dr Kay Scarpetta novels by Patricia Cornwell.
作为海军下级军官，在出勤海上的短暂旅途中，他都会沉迷于帕特丽夏·康威尔的《凯·斯卡皮特博士》。
But when the camp’s uniformed occupants, many on a third or fourth tour of duty there, discuss their dealings with the country’s leaders, the word that dominates their talk is tribe.
然而，第三，第四服役期的许多美军军官讨论他们与伊拉克各派领袖的关系时，他们谈话中使用最多的就是 “部族”。

He is believed to have had serious reservations about the upcoming tour of duty in a Muslim nation.
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.

They have served tour after tour of duty in distant, different and difficult places.
WHITEHOUSE: President Obama at Fort Hood: "Greatness Before Our Very Eyes" The White House

a period of time that someone, especially a soldier or an official, spends working in a foreign country

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.