footings

例句：

1. 1. The engineers were working on the footings of the new building.
   工程师们正在为新建筑的地基工作。
2. 2.The foundations of the house are still being poured.
   房子的基础仍在浇筑中。
3. 3.The builders used wooden frames to support the weight of the roof.
   建造者使用木框来支撑屋顶的重量。