1、[数]简单闭曲线
如果你知道左边的复杂图形在数学上称为“简单闭曲线” (simple closed curve)，你可能会感到惊讶.
2、简单封闭曲线
... 开放/封闭曲线 Open/Close Curves 简单封闭曲线 simple closed curve 沿封闭曲线的环流 circulation around closed circuit ...
simple e closed curve简单闭曲线
Simple closed convex curve简单闭凸曲线
convex simple closed curve凸简单闭合曲线