presentation_application_layer

1.There are only a few places to implement performance gains in an application – the presentation layer, the application layer, and the storage layer.
在一个应用程序中仅有几个地方能够实现性能增益 - 表示层、应用层和存储层。
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2.Model refers to your data, View to your presentation layer, and Controller refers to the application or business logic.
模型指数据，视图指表示层，而控制器指应用程序逻辑或业务逻辑。
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3.It keeps the presentation layer separate from the application layer.
它把表示层和应用程序层分隔开。
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