货币在实现其作为交换媒介的功能的时候，只是促进了商品和服务的流动。
In fulfilling its role as the medium of exchange, money just facilitates the flow of goods and services.
是的，我们连接在一张社交网络上，但是在很多情况下，“友谊”仅仅只是信息流动的媒介，而且流动大多是单向的。
Yes, we're linked in a social network. But in many cases the friendship is really just a vehicle that allows information to flow, and that flow is largely one-way.
古代囿于诸如传播手段和媒介等的种种限制，文化的传播又离不开人口的流动和迁移。
In ancient times, with the limitation of means and media, the spreading of culture was always associated with the flow and immigration of people.
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