instability strip

例句：

1. 1. The instability stripis a critical part of the design thataffects the stability of the structure.
   不稳定带是设计中的关键部分，影响结构的稳定性。
2. 2. The instability strip was designed to preventthe formation of cracks during theconstruction process.
   不稳定带的设计是为了在施工过程中防止裂缝的形成。
3. 3. The instability stripwas used to reinforce the weak areas ofthe concrete beam.
   不稳定带被用来加固混凝土梁的薄弱区域。