sunk drill

例句：

1. 1. The engineer used a sunk drillto bore through the rock.
   工程师使用沉井钻机钻穿了岩石。
2. 2. The downhole drilling equipment was essential for thesuccessful completion of the project.
   下井钻探设备对于项目的成功完成至关重要。
3. 3. Thesunk drill was designed to withstandextreme pressure and temperatures underground.
   沉井钻机设计用于承受地下极端的压力和温度。