挖掘地基

例句：

1. 1. The engineers were excavating a new roadthrough the mountain.
   工程师们正在挖掘一条穿过山的新的公路。
2. 2. Theconstruction crew was excavating the foundation for the newbuilding.
   建筑工人正在为新大楼挖掘地基。
3. 3. The geologists were excavating the site to find evidence of ancientcivilizations.
   地质学家们正在挖掘现场以寻找古代文明的证据。