一个圆沿固定直线无滑动滚动时,圆周上一点的轨迹。
The locus of a point on the circumference of a circle that rolls without slipping on a fixed straight line.
圆沿直线滚动时圆上一点形成的曲线
a line generated by a point on a circle rolling along a straight line
具有圆鳞的鱼。
A fish having cycloid scales.
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