bridge substructure

例句：

1. 1. The engineer designed the bridge with a substructure that could support heavy loads.
   工程师设计了一座可以承受重载的桥梁。
2. 2.The construction of the bridge required extensive excavation and the installation of its substructure.
   建造这座桥梁需要进行大量的挖掘和安装其基础结构。
3. 3. The substructure of the bridge is made of reinforced concrete to ensure its strength and durability.
   桥梁的基础结构由钢筋混凝土制成，以确保其强度和耐久性。