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The UML with PowerPoint and Disposable UML approaches described above suffer from a similar problem: Neither one treats the model and its artifacts as primary citizens.

上面介绍的用 PowerPoint 的 UML 和可任意处理的 UML 的方法遭遇类似的问题：没人将模型及其工件作为主要的部分。

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The primary instance of the model is keeping long-term state and providing application logic; the copy used by the view is essentially a disposable data-access object.

模型的主实例保持长期状态，并提供应用程序逻辑；而视图使用的副本实际上是一个可任意使用的数据访问对象。

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Using a model that ties house prices to disposable incomes and long-term interest rates, analysts at Goldman Sachs reckon that the correction in national house prices is only halfway through.

ECONOMIST: The house-price bust has a long way to go