单词：curve tracing
curve tracing的用法和样例：
例句
- The curve traced by a point on the circumference of a circle that rolls on a straight line.圆滚线，摆线圆周上任一点在一条直线上滚动时所形成的曲线
- 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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