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但 NS 方程终究只是一个对流体在连续介质层面的物理近似，是一个对流体在分子动力学层面进行粗粒化（coarse-graining）的物理模型。当然，大量的实验、研究表明，NS方程在绝大部分情况下还是非常优秀的一个模型。