All things being equal, which they rarely are, the higher the cyclical stress level on an aircraft structure, the fewer the number of reversals 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
Cyclical changes in climate conditions could cause the changes of lake level, sediment supply and sedimentation types, then impact the lake basin deposit and the lake level fluctuation.