Notice that the yellow fields inside of the heart appear paler than the fields forming the contour of the heart, which appear to be a darker shade of yellow/orange.
你可以看到图中心形里边的黄色比构成心形轮廓的颜色更浅一些，心的轮廓好像是颜色更深的黄或橘黄。
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In the forming technique of cylindrical spiral curved surfaces, the contour of workpiece is virtually the result that disk shaped milling tools feed into the workpiece and move around its axis.
When fitting each contour line, the points measured by non - contact measuring system are as the top points about control polygon for forming EE spline curve.