但是，当价值储存变得相当重要时，在那些人民更富裕，更文明的社会里，交换的中介必须是种更为耐用的物品，通常金属会被选中。

But where store-of-value considerations are important, as they are in richer, more civilized societies, the medium of exchange must be a durable commodity, usually a metal.

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作为一个被广泛接受的交换中介，货币消除了以货易货，即一个物品与另一物品直接交换。

A medium of exchange. As a generally accepted medium of exchange, money rules out the need for barter, the direct exchange of one item for another.

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研究了电子中介处理个人之间单件物品交易时的多属性匹配问题。

Multi-attribute evaluation problem of commodity is researched when electronic broker settles four different buyer-demanders.

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