The circular points are really a degenerate conic.
虚圆点实际上是一退化的二次曲线.
A curve or surface whose equation ( in Cartesian coordinates) is of the second degree. The circular points are really a degenerate conic.
方程式是二次方程式的曲线或表面。虚圆点实际上是一退化的二次曲线。
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