流体的流速与流线的间距成反比。
The velocity of the fluid is inversely proportional to the spacing of the streamlines.
化工研究中经常要涉及到流体，需要对流体的流速进行测量。
The research work in chemical engineering always deals with fluid, its velocity needs to measure.
分析了壁面的润湿性对流体的流速、流量和粒子的分布影响。
The effects of different wettability boundary to the liquid flow, the flow rate and the distribution of particles were investigated.
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