friction hammer

例句：

1. 1. The friction hammer is usedto remove rust from metal surfaces.
   摩擦锤用于从金属表面去除锈。
2. 2. He useda friction hammer to break open the door.
   他用摩擦锤打开了门。
3. 3. Thefriction hammer was an essentialtool for the construction workers.
   摩擦锤是建筑工人必不可少的工具。