当你拔去水槽的塞子，水就会开始搅动，形成涡流。

You pull the plug. The water stirs.

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③连续震颤脉。震颤脉象的机理是血液在血管内形成涡流（湍流）。

The mechanism of TP is due to the circular movemant of blood flowing within the vessel.

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支承结构造成的流体绕流现象在风机进口处形成涡流，造成风机风量减少，噪声增加，浪费能源。

Vortexs are observed after the beams, which greatly influence the inlet air-flow of fan, reduces the air-flux, causes noise and wastes energy.

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