jack hammer [矿业] 凿岩锤 ; 气锤 ; 手持式凿岩机 ; 凿岩机
jack hammer drill 手提锤钻
motor jack hammer 内燃凿岩机
rotary jack hammer 旋转式凿岩机
shocking jack hammer 冲击式凿岩机
air-rider jack hammer 气腿式凿岩机
hydraulic jack hammer 液压凿岩机
electric jack hammer 电动凿岩机
N-COUNT A jackhammer is a large hammer, powered by compressed air, that is used for breaking up rocks and other hard material. 手提钻
Outside a jackhammer was pounding away at a particularly stubborn piece of concrete.
在外头，一个手提钻正在猛打一块特别坚硬的混凝土块。
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