长期循环的英文

long cycle

secular cycle

• 长期:    over a long period ...
• 循环:    circulate; circle; ...
• 长期循环防潮性试验:    prolonged humidity ...

例句与用法

1. Requires no retorquing after long cycling
   经过长期循环测试后，不需要回位扭矩。
2. But , at the present situation , the down hole progressing cavity pump is driven by the motor and reducer placed on the ground via a thin and long rod , and this cause troubles easily because of the rod works in cycling bending and distortion
   目前螺杆泵采油系统采用地面电机和减速装置通过细长抽油杆驱动井下螺杆泵，这种驱动方式由于抽油杆旋转时处于长期循环扭曲状态，系统很容易出现故障。