drill centering machine

例句：

1. 1. The drill operator carefully controlled the speed of the drilling machine.
   钻机操作员小心地控制着钻机的钻进速度。
2. 2. The engineer drilled a hole in the wall for the new pipe.
   工程师在墙上钻了一个新管道的孔。
3. 3. The drill bit was worn out after several hours of hard work.
   经过几个小时的辛勤工作，钻头磨损了。