此函数提供了去掉边缘锯齿的功能，虽然牺牲了速度，却改进了图像的质量。
This function provides anti-aliasing of the edges and improves the quality of the image at the cost of speed.
其中一个比较好的特性是，为了清晰起见，每个新的函数项呈锯齿状排列。
A nice feature is that each new function entry is indented for clarity.
其中一个比较好的特性是，为了清晰起见，每个新的函数项呈锯齿状排列。
A nice feature is that each new function entry is indented for clarity.
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