地球为什麼绕太阳是椭圆形?变化公式
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![地球为什麼绕太阳是椭圆形?变化公式](/uploads/image/z/12274173-45-3.jpg?t=%E5%9C%B0%E7%90%83%E4%B8%BA%E4%BB%80%E9%BA%BC%E7%BB%95%E5%A4%AA%E9%98%B3%E6%98%AF%E6%A4%AD%E5%9C%86%E5%BD%A2%3F%E5%8F%98%E5%8C%96%E5%85%AC%E5%BC%8F)
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