访问者模式往往用于将数据结构(本例中是树)与通过数据结构操作的算法分离开来。

The Visitor pattern is often used to separate a data structure (the tree, in this case) from the algorithms that operate over the data structure.

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首先，CAM将结构与业务规则分离开来。

First, CAM separates structure from business rules.

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Model - View - Controller (MVC)体系结构是把输入表单的数据和具体的屏幕表示分离开来的一种方式。

A Model-View-Controller (MVC) architecture is a way of separating data entered in a form from its actual screen representation.

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