圆的反演：反演成一圆。但当圆通过反演中心时变成一直线。

Inverson of circle: Into a circle, if the circle pass through inversion center o, it becomes a straight line.

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圆的反演：反演成一圆。但当圆通过反演中心时变成一直线。

Inverson of circle: Into a circle, if the circle pass through inversion center o, it becomes a straight line.

youdao