symmetric stress cycle

例句：

1. 1. The design of the new car is symmetrical and visually appealing.
   这款新车的设计是对称的，外观也很吸引人。
2. 2.During the manufacturing process, the symmetric stress cycle is critical for ensuring quality.
   在制造过程中，对称应力循环对于确保质量至关重要。
3. 3.The symmetry in the stress cycle helps to reduce fatigue and extend the lifespan of the materials.
   应力循环的对称性有助于减少疲劳并延长材料的使用寿命。