constant section beam

例句：

1. 1.The constant section beam is crucial for thestability of the bridge.
   恒定截面梁对于桥梁的稳定性至关重要。
2. 2. The engineer designed a constant sectionbeam to withstand the weight of thebuilding.
   工程师设计了一个恒定截面梁来承受建筑物的重量。
3. 3. The constant section beam was usedin the construction of the new bridge.
   恒定截面梁被用于新桥的建设。