抛物线的光学性质：所有从焦点�出的光经过反射会平行射�远方。怎么用平面几何证明？ 知乎 Sketch Coloring Page

抛物线的光学性质：所有从焦点�出的光经过反射会平行射�远方。怎么用平面几何证明？ 知乎 Template

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