digging radius

例句：

1. 1. The excavation was limited to a depth of 50 meters.
   挖掘深度限制在50米以内。
2. 2. The drilling radius is sufficient for the construction of this tunnel.
   钻探半径足够建造这条隧道。
3. 3. The digging radius of the pit is 100 meters.
   这个坑的挖掘半径是100米。