When the pressure transients occur in low pressure pipelines such as the suction lines of pumps or the returnlines 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。
2
The following week the same contestants return with new accents, new jaw lines, new walks and new attitudes just to please their critics.
Those who did try to return calls found the lines busy (just in case people think I mean deliberately jammed), leading to critical communication lags amid a constantly shifting situation.