jack hammer
柯林斯词典
1. 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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