... 卑屈的 servile 渐屈的 evolute 可屈的 flexional ...
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曲线的渐屈线 Evolute of a curve
渐屈的
evolute
以上为机器翻译结果，长、整句建议使用 人工翻译 。
然后他讨论了平面曲线的渐屈线。
He then treated the evolute of a plane curve.
youdao
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。
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 .
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