king and queen post truss

例句：

1. 1.The post truss is the main support for the roof.
   桁架是屋顶的主要支撑。
2. 2. The engineer designed the post truss to withstand heavy loads.
   工程师设计了桁架来承受重负载。
3. 3.The post truss was installed in the middle of the building.
   桁架被安装在建筑物的中心。