shaft sinking drill

例句：

1. 1. The engineer used a shaft sinking drill to bore through the rock.
   工程师使用钻杆下沉钻头钻穿了岩石。
2. 2. The down-drill was designed to penetrate deep into the earth.
   这种钻头设计用来深入地下。
3. 3. During construction, the down-drill was used to level the ground.
   在施工过程中，用这种钻头来平整地面。