图元文件（运行时绘制图像的图形指令列表）比位图更适合于拉伸图片。
Metafiles, which are lists of graphics instructions for drawing images at run time, are better suited for stretching than bitmaps are.
图元文件（运行时绘制图像的图形指令列表）比位图更适合于拉伸图片。
Metafiles, which are lists of graphics instructions for drawing images at run time, are better suited for stretching than bitmaps are.
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