drill bit

例句：

1. 1.He used a drill bit to make holes in the wood.
   他用钻头在木头上打孔。
2. 2. The carpenter needed a drill bit for his new project.
   木匠需要一把钻头来完成他的新项目。
3. 3.The engineer tested the drill bit before starting the assembly process.
   工程师在组装过程开始前测试了钻头。