cross beam

例句：

1. 1. The engineer used a cross beam to support the roof.
   工程师用横梁支撑屋顶。
2. 2. The carpenter was working on building a cross beam for the bridge.
   木匠正在为桥梁制作横梁。
3. 3. The construction workers were busy installing the cross beams in the factory.
   建筑工人忙于在工厂安装横梁。