knoppers

例句：

1. 1. The carpenter used a knopper to make the holes in the wood.
   木匠用钻头在木头上钻出孔洞。
2. 2.The chisel was sharp enough to easily remove the old paint from the wall.
   凿子足够锋利，可以轻松地将旧油漆从墙上除去。
3. 3. The drill is the tool that allows us to make holes in metal for screws and bolts.
   钻机是我们用来在金属上打孔以便安装螺丝和螺栓的工具。