precision boring bar

例句：

1. 1.The precision boring bar is used to drill holes in the rock.
   精密钻杆用于在岩石中钻孔。
2. 2. The engineer used a precision boring bar to bore a hole in the wall.
   工程师使用一个精密钻杆在墙上钻孔。
3. 3. The precision boring bar was essential for the construction of the bridge.
   精密钻杆对于桥梁的建设至关重要。