1.  circular points
2.  focoid
3.  imaginary circular point

• 1. 虚圆点: imaginary circular point | focoid | imaginary circle point
• 2. 曲面上的虚圆点: circular point on a surface
• 3. 重[虚]圆点四次线: bicircular quartic

更多释义

• 1.虚圆点实际上是一退化的二次曲线。
  The circular points are really a degenerate conic.
  dict.yoduao.com
• 2.重虚圆点四次曲线是很重要的一类高次平面曲线。
  Bicircular quartic is a very important classics of higher plane curves.
  dict.yoduao.com

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