combined permanent deformation

例句：

1. 1. The earthquake caused combined permanent deformation of the buildings.
   地震导致建筑物发生了结合永久变形。
2. 2. The research team discovered a new method to prevent combined permanent deformation in concrete structures.
   研究团队发现了一种新的方法，用于防止混凝土结构中的结合永久变形。
3. 3.The engineers were worried about the potential for combined permanent deformation in the new bridge design.
   工程师们担心新桥梁设计中可能存在的结合永久变形问题。