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The development of the caves is in close connection with underground drainage network;
研究区洞群洞腔发育受区域构造裂隙的控制，与地下水文网的关系密切；
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Urban drainage pipe network is important establishment of a city.
城市排水管网是城市的重要基础设施。
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Urban drainage pipe network is important establishment of a city.
城市排水管网是城市的重要基础设施。
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