parabolic chord truss

例句：

1. 1.The parabolic chord trusses are used to support the roof of a building.
   抛物线弦桁架用于支撑建筑物的屋顶。
2. 2.The parabolic chord trusses are designed to withstand high winds and heavy loads.
   抛物线弦桁架设计来承受大风和重载。
3. 3.The parabolic chord trusses are an essential part of the structural design of buildings.
   抛物线弦桁架是建筑结构设计中不可或缺的一部分。