| 释义 |
〔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〔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 |