major principal stress

例句：

1. 1.The structure of the material is mainly determined by its major principal stress.
   材料的结构主要由其主应力决定。
2. 2. During the construction process, it is important to consider the major principal stresses in the ground.
   在施工过程中，需要考虑地面的主要应力。
3. 3. The design of the bridge must take into account the major principal stresses and their effects on the surrounding environment.
   桥梁的设计必须考虑到主要应力及其对周围环境的影响。