repeat operation的用法和样例：
例句
- Usually, repeated operation of a relay will cause the contact resistance to increase gradually over time.
一般而言，继电器的重复操作将导致接触电阻随时间的大幅度上升。 - This algorithm avoids the numerous repeated operations for getting many pixel color values without increasing the number of push and pop operations.
改进后的算法不增加入栈出栈操作的次数，却免除了原算法中为获取众多象素颜色值所需要的大量重复操作。
