vertical center keelson

例句：

1. 1.The construction of the bridge required the installation of vertical center keelson.
   建造这座桥需要安装垂直中心桁架。
2. 2.The engineer carefully designed the vertical center keelson to ensure its stability.
   工程师仔细设计了垂直中心桁架以确保其稳定性。
3. 3.The vertical center keelson played a crucial role in supporting the weight of the bridge.
   垂直中心桁架在支撑桥梁重量方面起到了关键作用。