它开始时和我们最终得到的东西很不一样，它原来的目标是开发一个对话作用域（conversation scope），最原始的任务是开发一个介于JSF和EJB3之间的对话域，全局JSF-EJB3集成也是其中之一。
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conversation作用域内的bean需要更多技巧，因为它们基于对话令牌的存在而与HTTP请求相关联。
Conversation-scoped beans are trickier, though, because they are associated with an HTTP request based on the presence of the conversation token.
当处理conversation作用域内的bean时，您必须要能够在远程调用期间建立正确的对话上下文。
When you're working with conversation-scoped beans, you need to be able to establish the correct conversation context during the remote call.
引用conversation作用域内的bean不需要任何额外的工作，原因是这些bean总是对在同一个浏览器对话中发出的HTTP请求可用。
Referencing session-scoped beans requires no extra work because they are always available to an HTTP request made within the same browser session.
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