还有些其它网站也允许用户互换物品和服务，即物品交换。
Other Web sites let users exchange goods and services, or barter.
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.
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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