loop frame

例句：

1. 1. The engineer designed a loop frame to support the roof.
   工程师设计了一个循环框架来支撑屋顶。
2. 2.The loop frame is crucial for the stability of the bridge.
   循环框架对于桥梁的稳定性至关重要。
3. 3.The loop frame was used to reinforce the beams in the construction.
   循环框架被用来加固施工中的梁。