特别是，网关可以用在“批发”方案中，在这种方案中服务提供者是外部服务的中介者或门户网站。
In particular, the gateway can be used in the "wholesale" scenario, where a service provider is a broker or portal for external services.
通常每个行业或产品领域都有特定的展览、分析师、出版物、博客和零售批发点。
Specific trade shows, analysts, publications, blogs and retail/wholesale outlets tend to be fairly common to each industry/product area.
零售商直接从制造商或从批发商那里购买商品。
Retailers buy goods directly from the manufacturer or from a wholesaler.
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