为什么地球是圆的?光是怎么穿过玻璃的?
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![为什么地球是圆的?光是怎么穿过玻璃的?](/uploads/image/z/277786-10-6.jpg?t=%E4%B8%BA%E4%BB%80%E4%B9%88%E5%9C%B0%E7%90%83%E6%98%AF%E5%9C%86%E7%9A%84%3F%E5%85%89%E6%98%AF%E6%80%8E%E4%B9%88%E7%A9%BF%E8%BF%87%E7%8E%BB%E7%92%83%E7%9A%84%3F)
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