fluctuating stress的用法和樣例：
例句
- In the process of dynamic unloading, the radial stress unloaded first and then rebounded, the circum stress concentrated.
初始應力動態卸荷時，動應力在隧洞徑向表現為卸荷回彈，而在切向出現動應力集中，表現為加載。 - Under the action of the horse head movement, the vibration of the sucker-rod and, furthermore, thedynamic stress will be induced.
在這種懸點位移作用下，將引起抽油桿柱的振動，導致桿柱中的動應力。
