first principal stress

例句：

1. 1. The engineer determined the first principal stress in the structure.
   工程师确定了结构中的第一主应力。
2. 2. The material's strength is primarily influenced by its first principal stress.
   材料强度主要由其第一主应力决定。
3. 3.During the construction phase, the first principal stress must be considered to prevent potential failures.
   在施工阶段，必须考虑第一主应力以防止潜在的失败。