flex fatigue

例句：

1. 1.The athletes are feeling the strain of their rigorous training schedule.
   运动员们正在感受到他们严格训练日程的压力。
2. 2. The car's suspension system is prone to flex fatigue due to its long travel distance.
   汽车的悬挂系统由于其长行程距离而容易发生弹性疲劳。
3. 3. The engineers were concerned about the potential for flex fatigue in the new design.
   工程师们对新设计中可能出现的弹性疲劳问题表示担忧。