digging method

例句：

1. 1. The engineer was digging a tunnel to connect two cities.
   工程师正在挖掘一条隧道，连接两个城市。
2. 2.The team of geologists is digging for minerals in the desert.
   地质学家团队正在沙漠中挖掘矿物。
3. 3.The farmer was digging a well to provide water for his farm.
   农民正在挖井，为他的农场提供水源。