When the pressure transients occur in low pressure pipelines such as the suction lines of pumps or the return lines of a hydraulic system, gas bubbles and cavitation will occur inside the fluid.

当压力脉动发生在液压泵的吸油管路或液压系统的回油管路等低压管路中时，会引起气泡和气穴的产生及破灭。

youdao

So this line or these lines of code up here are arguably constant time steps to say if N is less than 2 in return, that it will always take maybe one step, maybe two steps, some number of fixed CPU cycles.

如果N小于2并返回,那么这些行所对应的代码,通常只需要执行一步，或者两步，具体数字与CPU周期有关。

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