除了使用应用程序状态之外，还可以使用ASP。

AS an alternative to using application state, you can use the ASP.

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因为应用程序使用无状态的服务接口，所以此时的课程实例 看作已经与持久化上下文 “分离”。

Because the application uses a stateless service interface, the course instance is at this point considered "detatched" from the persistence context.

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使用模块化，应用程序的状态和数据共享会变成一个问题。

With modularity, application state and data sharing can become an issue.

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