All things being equal, which they rarely are, the higher the cyclical stress level on an aircraft structure, the fewer the numberofreversals it can withstand before breaking.
所有的事情很少是平等的，飞机结构上的周期性压力水平更高，破碎前它可以承受倒转的数字就更少些。
2
The two helical nanofibers usually change helical senses (helical reversals) at the coil position of the same cycle number.
这两根螺旋纤维经常在相同螺旋圈数的位置同时发生螺旋旋向的改变，即螺旋反转。
3
There have been so many reversals that it is not likely that all have caused the demise of a large number of species.