1. The point at which a continuous curve crosses itself. 
   叉点连续的曲线自身的交叉点
2. The curve traced by a point on a taut, inextensible string as it unwinds from another curve. 
   切展线；渐开线当一根绷紧而不能拉长的细线从一弧线上延展出去时在其上一点所画的弧线
3. A point at which a curve crosses itself and at which the two tangents to the curve coincide. 
   尖点，会切点曲线上的一个点，曲线在该点与其本身相交，曲线的两条切线在该点重合
4. a constant in the equation of a curve that can be varied to yield a family of similar curves. 
   曲线方程式中决定相似曲线族的常数。
5. A plane curve everywhere equidistant from a given fixed point, the center. 
   圆，圆形从定点（圆心）等距离到任一点的平面曲线

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