A heart-shaped plane curve, the locus of a fixed point on a circle that rolls on the circumference of another circle with the same radius.

 
  • 心臟線(xiàn)一種心形的平滑曲線(xiàn),圓周上一固定點(diǎn)繞另一具有相同半徑的圓的圓周轉動(dòng)的軌跡
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