overhead beam discplough

例句：

1. 1. The engineers were busy installing the overhead beam.
   工程师们忙于安装过梁。
2. 2. The beam was too heavy for the crane to lift.
   这个梁太重了，起重机无法抬起。
3. 3. The beam was used to support the roof of the building.
   这个梁用来支撑建筑物的屋顶。