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http://upload.wikimedia.org/wikipedia/commons/thumb/5/51/Brownianmotion5particles150frame.gif/220px-Brownianmotion5particles150frame.gif
经过周密的分析与推理,Einstein建立了所谓”散射方程“(Diffusion Eguation):
http://upload.wikimedia.org/wikipedia/en/math/c/d/f/cdf7ffbbab4601275c5cb96a8e69ad4f.png