1. the constant angle at which a helix cuts the elements of a cylinder or cone. 
   一个螺旋状物切割圆柱体或圆锥体的某些部分而形成的连续的角。
2. a curve that lies on the surface of a cylinder or cone and cuts the element at a constant angle. 
   位于圆柱体或圆锥体表面上且以不变的角度相交于元件的曲线。
3. A three-dimensional curve that lies on a cylinder or cone, so that its angle to a plane perpendicular to the axis is constant. 
   螺旋线附着于圆柱体或圆锥体之上的三维曲线，其垂直于中轴线的平面角是一个恒量
4. A plane curve having two branches, formed by the intersection of a plane with both halves of a right circular cone at an angle parallel to the axis of the cone. It is the locus of points for which the difference of the distances from two given points is a constant. 
   双曲线有两条分支的一个平面曲线，由一个平面与一个直立的圆锥以与锥的中轴相平行的角度相切而成，它是切点的轨迹，在这个轨迹上任何点与给定的两点之间的距离变化是个常数
5. moxibustion with moxa cone 
   艾炷灸法

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