挖除淤泥

例句：

1. 1. The engineers are excavating a new tunnel to connect two cities.
   工程师们正在挖掘一条新的隧道，连接两个城市。
2. 2. The construction crew is excavating the foundation for the new building.
   建筑工人正在为新建筑挖掘地基。
3. 3.The geologist found evidence of ancient civilizations buried beneath the surface.
   地质学家在地表下发现了古代文明的遗迹。