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给出椭圆等距线的方程式，证明了椭圆的等距线不是椭圆，进而明确了用数控磨床加工外椭圆轮廓时，刀具的中心轨迹应该是已知椭圆的等距线而不是椭圆。
The equation of elliptic equidistance line is given, which proves that the equidistant line of the ellipse is not an ellipse, and then the central trajectory of the tool should be the equidistant line of the known ellipse instead of the ellipse when the outer elliptical contour is machined by a numerical control grinder.