求翻译：4）低压情况下，从入口到出口液体的流速逐渐减小，而在高压时，由入口到出口，速度呈现由最大变为最小，然后又增大的变化趋势，速度变化急剧；是什么意思？

4) low-pressure case, the liquid from the inlet to the outlet flow rate decreases, while at high pressure, by the entrance to the exit, speed, showing the largest changes from the minimum, then increasing trends, speed changes rapidly;

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4) under low pressure conditions, from the entrance to the exit velocity of the liquid gradually diminished, and at the time of high pressure from entrance to exit, from maximum to minimum speed rendering, then increasing trend, speed changes dramatically;

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