I-shaped beam

例句：

1. 1.The beam was too weak to support the weight of the roof.
   这个梁太弱了，无法支撑屋顶的重量。
2. 2. They used a steel I-beam to reinforce the wall.
   他们使用了一个钢制的I形梁来加固墙壁。
3. 3.The engineer designed the beam to be flexible enough to accommodate any changes in load.
   工程师设计了这个梁足够灵活，以适应任何载荷的变化。