freely supported beam

例句：

1. 1. The beam was so strongthat it could support the weight of acar.
   这个梁非常坚固，可以支撑汽车的重量。
2. 2. Thebeam was used to support theroof of the building.
   这个梁被用来支撑建筑物的屋顶。
3. 3. Thebeam was designed to withstand high winds and heavy rain.
   这个梁被设计来承受大风和大雨。