arch roof truss

例句：

1. 1.The architect designed a modern and elegant arched roof for the new office building.
   这位建筑师为新办公楼设计了一个现代而优雅的拱形屋顶。
2. 2. The construction of the arched trusses was completed ahead of schedule.
   拱形桁架的建设提前完成了。
3. 3. The arched girders were used to support the weight of the heavy wooden beams.
   拱形桁架被用来支撑沉重的木梁的重量。