框架组件的行为正好类似于状态机：输入消息、输出消息和组件状态是模型的组成部分。

Framework components happen to behave like a state machine: input message, output message and component state are part of the model.

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它充当一个通用消息传送接口，适用于远程和本地框架组件。

It ACTS as a universal messaging interface that applies to remote and local framework components.

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定义应用的核心框架组件。

The core framework components that define your application.

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