从传统旅游到生态旅游，城市旅游至丛林探险，变化正在悄然发生。

Changes are being made from traditional sites to eco-tourism, rural tourism and adventure tourism.

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第四部分分析了生态旅游城市的循环机制。

Part IV: This part analyzed the circular mechanism of the ecological tourism urban.

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内容包括生态旅游城市的概念阐释、生态旅游城市的特点和生态旅游城市的建设模式。

And the contents include the explanation of the notion of the ecological tourism urban, its characters and its construction mode.

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