sniper [ˈsnaɪpə(r)]

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n.阻击手

someone who shoots at people from a place where they cannot be seen

A sniper behind the bushes picked off three of our men.藏在树丛后面的一个狙击手射死了我方三个人。
The sniper snapped off six rapid shots.狙击手迅速地连放了六枪。