"Distribution of membership" mainly depends on the price difference income, for one, is a "zero risk" business model.

“分销会员”主要靠差价获得收入，对个人来说，是一种“零风险”的创业模式。

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RANDN (n) is an N-by-N matrix with random entries, chosen from a normal distribution with mean zero, variance one and standard deviation one.

是一个n - n矩阵随机作品，选自正态分布均值为零，方差一个标准偏差为一。

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