位置和标识虚拟化：服务使用者不需要知道服务提供者的位置。
Location and identity virtualization: the service consumer doesn't need to know the location of the service provider.
我们不断变化的自然语言的构成并不依赖任何个体，它是语言使用者的集体化产物。
What constitutes our constantly changing natural language is not up to any individual, it is a matter of where the collective of language speakers takes it.
代理的操作原则是将 Portlet 作为类型化属性的生产者和使用者；因此，它也称为 属性代理 (Property Broker)。
The broker operates on the principle of portlets being producers and consumers of typed properties; therefore, it is called the Property Broker.
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