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如何简明地给文科生解释曲率（curvature）？ - 知乎
source link: https://www.zhihu.com/question/25952605/answer/713083818
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1 地球是圆的历史上很长的时间，人们都觉得地球是平的：不过如果在海边，还是容易发现地球其实不是平的。…
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