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古希腊到中世纪前的西方是否主流认为地圆说，那为什么没有提出地心引力来解释球下面的...
source link: https://www.zhihu.com/question/317670248/answer/634074864
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答案放在最前面，为什么中世纪之前没有人提出“地心引力”理论，因为地心引力理论真的非常困难。甚至牛顿…
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