| 释义 |
DEFINITIVE EXAMPLES 权威例句〔hypocycloid〕The plane locus of a point fixed on a circle that rolls on the inside circumference of a fixed circle.圆内旋转线，内摆圆：在一个固定的圆周内旋转的圆上一点的水平轨迹美国传统〔toroid〕A surface generated by a closed curve rotating about, but not intersecting or containing, an axis in its own plane.超环面：由封闭曲线绕其所在平面某一轴旋转而生成的平面，这些旋转线都互不交叉或包含美国传统〔trochoid〕A curve traced by a point on or connected with a circle as the circle rolls along a fixed straight line.旋转线，次摆线：圆在固定直线上滚动时，圆上一点或与圆相连的一点的弧形轨迹美国传统 |