alternating stress intensity

例句：

1. 1. The design of the bridge is based on the principle of alternating stress.
   这座桥的设计基于交替应力的原理。
2. 2. The material used in the construction of the bridge is highly resistant to alternating stress.
   建造这座桥所用的材料对交替应力具有很强的抗性。
3. 3. The engineers have developed a new method to calculate the alternating stress intensity.
   工程师们已经开发了一种新方法来计算交替应力强度。