AspectRatio
 Usage
• AspectRatio 是 Show及相关函数的可选项，用来指定图形的高与宽的比值.
Notes
• AspectRatio确定最后图象形状的比例. • AspectRatio -> Automatic 确定图形中真实坐标的高与宽的比值 . • 二维图形的缺省值是AspectRatio -> 1/GoldenRatio .三维图形的缺省值是AspectRatio -> Automatic.
 Further Examples
The default setting of AspectRatio is GoldenRatio. Setting the option to Automatic makes the height-to-width ratio  . Evaluate the cells to compare the graphics.
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