When a resource is requested, a physical immutable representation of that abstract resource is returned.
当资源被请求的的时候，一个物理的、无法被修改的该资源的抽象表示会被返回。
A Web service is an abstract resource that provides a set of functions, implemented by an agent, which sends and receives messages.
Web服务是一种抽象资源，它可以提供一组功能，通过代理实现，可以发送和接收消息。
Transactions in the cloud must be an abstract resource managed by the cloud and transactions between the cloud and the traditional web applications must be truly interoperable and transparent.
云中的事务必须是由云管理的抽象资源，而云和传统web应用程序之间的事务必须是真正可互操作并且透明的。
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