excavating foundation for checking purpose

例句：

1. 1.The engineer was excavating the foundation for the new building.
   工程师正在为新建筑挖掘地基。
2. 2. The team spent hours excavating a tunnel through the mountain.
   团队花了数小时在山中挖掘一条隧道。
3. 3. The construction workers were excavating the foundation of the new bridge.
   建筑工人正在为新桥的地基进行挖掘。