| 单词 | 旋转线 |
| 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 |
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