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如何看待中国古代建过都的城市，都不常会发生大的自然灾害？ - 知乎
source link: https://www.zhihu.com/question/329920590/answer/719235332
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南京城北那么大个玄武湖，除了水军操演之外最大的用处就是缓解南京的水患问题，不然早跟洞庭湖一样被填没…
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