The file can include physical constants, defaults for Handle Graphics properties, engineering conversion factors, or anything else you want predefined in your workspace.

该文件可包含物理常数，图形处理性能默认值，工程转换因子或其他在工作环境中用户需要设定的默认值。

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It is good practice when manipulating properties of the graphics object to restore them to the original values when finished.

在操作图形对象的属性时，在完成之后将这些属性恢复成原来的值是一种很好的做法。

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But why stop there? SVG also has tags that you can use to animate these properties, so you can move a graphics object along a path or fade it in or out.

不仅如此，SVG的标记还可用于动态改变这些属性，因此可以沿着路径移动图形对象或者实现淡入淡出效果。

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