要注意 SVG 如何运用了将级联样式表（CSS）类应用于不同图形对象的思想。

Notice how SVG uses the idea of Cascading Style Sheet (CSS) classes applied to various graphic objects.

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图形设计器它允许您轻松地将数据库对象，如表和存储过程映射为LINQ到SQL的类和方法。

It's a graphical designer which lets you easily map database objects such as tables and stored procedures to LINQ to SQL classes and methods.

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让我们首先来看一个图形环境对象和一个名为GraphicsObject的接口，它是使用一个line类实现的，功能就是用来画线。

Let's start with a graphics environment object and an interface called GraphicsObject implemented by a line class that draws lines.

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