trough beam

例句：

1. 1.The old building has a trough beam that supports the roof.
   这座旧建筑有一个支撑屋顶的横梁。
2. 2. The engineer used a trough beam to reinforce the wall.
   工程师使用横梁加固了墙壁。
3. 3. The construction crew was using a trough beam to support the weight of the new floor.
   施工队正在用横梁支撑新地板的重量。