A curve traced by a point on or connected with a circle as the circle rolls along a fixed straight l

中文解释

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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Ereshkigal derides dod 卫生 Rubia tinctorum Fungi Imperfecti long hundredweight fierce ambition metal ladder spur deliberately