sunk well foundation

例句：

1. 1.The foundation of the building is unstable due to the earthquake.
   由于地震，这座建筑的地基不稳定。
2. 2. The engineer carefully inspected the foundation before starting the construction.
   工程师在开始施工前仔细检查了地基。
3. 3. The foundation of the house was made of concrete and reinforced with steel bars.
   这栋房子的地基是用混凝土做的，并用钢筋加固。