这就是区域上所有点的等权平均值，区域上每一个点都是等权重的。
That is a uniform average where all the points on the region, all the little points of the region are equally likely.
然后再对所有的期货商品，以持仓金额为权重，计算对于基期数据比值的加权算数平均值，得到指数值。
To get the index, we firstly compute the mathematic average for single commodity price, using price and trading volume of all contracts.
针对求解物理量在一定区域内的平均值问题，设计了一种权重面积方法。
A weighted area scheme is designed for calculating mean value of a regional meteorological field.
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