当流量为零时，“环形流动”最强，扬程最高。
When the flow is zero, "circular flow" the strongest, the highest lift.
并不是所有液体质点都通过叶轮，随着流量的增加，“环形流动”减弱。
Not all liquid particles through the impeller, with the increase in traffic, "circular flow" weakened.
对于给出的每条排水沟，雨水只能沿着一个方向流动，注意可能会出现雨水环形流动的情形。
For any given ditch, water flows in only one direction, but there might be a way that water can flow in a circle.
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