bottom member

例句：

1. 1. The engineer designed thebuilding with a bottom member that could supportheavy loads.
   工程师设计了一座大楼，其底部构件能够承受重载。
2. 2. Theconstruction crew used the bottom member to reinforcethe foundation of the new bridge.
   施工队使用底部构件加固新桥的基础。
3. 3. Thebottom member is crucial for ensuring the stabilityand safety of the structure.
   底部构件对于确保结构的稳定性和安全性至关重要。