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

 
  • 旋轉線(xiàn),次擺線(xiàn)圓在固定直線(xiàn)上滾動(dòng)時(shí),圓上一點(diǎn)或與圓相連的一點(diǎn)的弧形軌跡
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