旅游活动对洞穴环境的影响及洞穴的自净能力研究——以重庆雪玉洞为例
여유활동대동혈배경적영향급동혈적자정능력연구——이중경설옥동위례
Impacts of Tourism Activities on Cave Environments and Self-purification Ability of the Cave: A Case Study of Xueyu Cave, Chongqing
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