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