推广来讲，本法可成形磨无拐点的任意曲线的齿轮，如圆孤齿轮等。
Further this method can grind any curved lineal gears, provided they have no inflexion, for example, knuckle gears and so on.
封闭曲线的路径是循环的，包围一个或更多区域，简单的例子如圆、椭圆、多边形。
A closed curve is a path that repeats itself, and thus encloses one or more regions. Simple examples include circles, ellipses, and polygons.
本算法的特点是利用面积相关性，而且特别适合于封闭曲线所围成的区域，如圆和椭圆等区域。
This algorithm USES the coherence properties of regions and is especially suitable for regions bounded by closed curves, eg. circles, ellipses etc.
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