jackhammer /ˈdʒækˌhæmə/

• 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

  例：

  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。