... plane Euclidean geometry 平面欧几里得几何学 plane evolute 平面渐屈线 plane field 平面场 ...
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He then treated the evolute of a plane curve.
然后他讨论了平面曲线的渐屈线。
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When the point moves along the plane curve , the trace curve of the point is called the evolute of the curve , denoted by, and is called the involute of the curve .
当点沿曲线移动时,相应的曲率中心的轨迹曲线称为曲线的渐屈线,而曲线称为曲线的渐伸线。
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