N-UNCOUNT Someone who is on active service is taking part in a war as a member of the armed forces. 战时服役 [oft 'on' N]
I served two more years on active duty, with one year overseas.
我服务了两年多的现役，其中一年在海外。
While attending school, I was called to active duty during the Vietnam war.
当我在医务学校时，我被派往越战那里服现役。
There are currently thought to be over 4, 000 robots on active duty in Iraq.
当前大约有4000个左右的机器人正在伊拉克执行任务。
Americans who attend these four-year colleges must serve at least five years of active duty.
VOA: special.2009.06.04
General MacArthur had been recalled to active duty by President Franklin Roosevelt.
VOA: special.2009.05.24
Of the few who have been identified, one is an active duty army general accused of being head of the military wing of the conspiracy, and another is an opposition political figure said to be leader of the civilian wing.
VOA: standard.2009.05.25
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