动词
中文翻译：服役
同义词：
['be in service', 'be on active duty']
例句：
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1. The soldier is currently serving his country.
这位士兵目前正在为他的祖国服务。
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2. The policeman is on active duty tonight.
警察今晚正在执行勤务。
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3. The soldiers are all currently serving their time in prison.
这些士兵目前都在服刑。