从椭圆的焦点出�的光线经过椭圆反射后经过另一个焦点，怎样形象的证明这个性质？ Sketch Coloring Page

从椭圆的焦点出�的光线经过椭圆反射后经过另一个焦点，怎样形象的证明这个性质？ Template

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tomski从椭圆的焦点出�的光线经过椭圆反射后经过另一个焦点，怎样形象的证明这个性质？ coloring

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