求翻译：　理论分析和实验都已证明，层流时的速度沿管径按抛物线规律分布，如图2所示。在层流状态中流体质点不互相的掺杂，流体作层状的运动，在这种流体状态，黏性起主要作用。是什么意思？

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The theoretical analysis and the experiment all had proven that, time the laminar speed along the caliber according to the parabola rule distribution, as shown in Figure 2.In the laminar conditions the fluid particle not mutual doping, the fluid makes the layered movement, in this kind of fluid cond

Theoretical analysis and experiments have proved that when laminar Velocity distribution along the pipe diameter according to the law of parabola, as shown in Figure 2. Physical fitness is not doping in laminar flow, fluid layered campaign, in which fluid, cohesive play a major role.

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