footwall

例句：

1. 1.The engineer carefully measured the footwall to ensure stability.
   工程师仔细测量了墙脚以确保稳定性。
2. 2. The construction workers were working on the footwall of the building.
   建筑工人正在建筑的墙脚工作。
3. 3. The footwall is critical for the structural integrity of the building.
   墙脚对于建筑的结构完整性至关重要。