shell-and-auger boring

例句：

1. 1.The engineer used a shell-and-auger boring to drill a hole in the rock.
   工程师使用一种钻孔机在岩石中钻了一个洞。
2. 2. The construction crew was busy using the shell-and-auger boring to level the ground.
   建筑工人忙于使用钻孔机平整地面。
3. 3.The boring machine is essential for drilling deep into the earth's crust.
   钻孔机对于深入地球地壳至关重要。