section beam

例句：

1. 1. The engineer designed the section beam to support the weight of the building.
   工程师设计了部分梁来支撑建筑物的重量。
2. 2. The construction crew used the section beam to reinforce the foundation.
   建筑工人使用部分梁来加固地基。
3. 3. The beam was too weak to hold the roof over the house.
   这个梁太弱，无法支撑屋顶覆盖在房子上。