该模型定义一组用于存放状态的类，而引擎管理这些信息对象的生命周期。

This model defines a collection of classes for holding the state, and the engine manages the life cycle of these information objects.

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面向对象的模型将系统定义为一组交互的主动和被动对象的集合。

The object-oriented model defines a system as a collection of sets of interacting active and passive objects.

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视角定义为模型视图的集合，使用一组关系图、文档和其他相关构件进行表示。

A viewpoint is defined as a collection of model views that are represented by a collection of diagrams, documents, and other related artifacts.

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