例如，可以明显地对销售量进行汇总，但单位价格应当是平均值。

For example sales amount can sensibly be summed but unit price should be averaged.

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例如，货物按照可对较大数量的购买给予优惠单位价格的价格清单销售。

As an example of this, goods are sold from a price list which grants favourable unit prices for purchases made in larger quantities.

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