jack hammer
柯林斯詞典
1. N-COUNT A jackhammer is a large hammer, powered by compressed air, that is used for breaking up rocks and other hard material. 手提鉆
Outside a jackhammer was pounding away at a particularly stubborn piece of concrete. 在外頭，一個(gè)手提鉆正在猛打一塊特別堅(jiān)硬的混凝土塊。
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