centring chisel

例句：

1. 1.The carpenter used a centringchisel to make the holes perfectly round.
   木匠使用中心凿子来使孔洞完美圆形。
2. 2. He carefully centred the chisel in the wood and started chisellingaway at it.
   他小心地把凿子对准木头，开始凿削。
3. 3. The tool isessential for accurately centring the drill bitin the material.
   这个工具对于将钻头精确地定位在材料中至关重要。