excavating radius

例句：

1. 1. The excavating machine is used to dig a large hole in the ground.
   挖掘机用来在地面上挖一个大洞。
2. 2. The excavating radius of the tunnel is 50 meters.
   隧道的挖掘半径是50米。
3. 3. The excavating radius is an important factor in determining the size of the hole.
   挖掘半径是确定孔径大小的重要因素。