渐伸线（involute）(或称渐开线(evolent))和渐屈线（evolute）是曲线的微分几何上互为表里的概念。若曲线A是曲线B的渐伸线，曲线B是曲线A的渐屈线。
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evolute surface [数] 渐屈面
filar evolute 线渐屈线
mean evolute [数] 中点渐屈线
middle evolute [数] 中渐屈线
plane evolute [数] 平面渐屈线
intermediate evolute 中间渐屈线
affine evolute [数] 仿射渐屈线
Evolute evolute 渐屈线
N a geometric curve that describes the locus of the centres of curvature of another curve (the involute). The tangents to the evolute are at right angles to the involute 渐屈线
ADJ having the margins rolled outwards (边缘)反卷的 [biology]
He then treated the evolute of a plane curve.
然后他讨论了平面曲线的渐屈线。
Technological innovation is a complicated system, and this system always evolute from inferior to upper.
技术创新是一个复杂的系统，而这个系统总是从低级向高级进化的。
Process of parametric modeling of bevel gear with standard evolute tooth on PC based CAD system is presented.
提出实体参数化逆向造型设计的方法，介绍应用该方法开发圆锥齿轮三维实体参数化造型设计系统的过程。
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