国内旅游循环经济的理论研究进展较为迅速，深度和广度都达到了一定的水平。
The theory research on the domestic circular economy of tourism proceeds rapidly, with the depth and the width reaching a certain level.
第五部分结合循环经济理论分析了生态旅游城市的旅游资源的开发与保护问题。
Part v: This part combined the development and protection of the tourism resources in the ecological tourism urban with the circulation economy theory.
而旅游业对当地环境也有正反两方面的影响，如果开发得当，可以使当地的社会-环境-经济系统进入良性循环，反之，当地的生态平衡有被破坏的危险。
The local Society-Environment-Economy system can be made into the good balance because of tourism, otherwise, the local ecological balance perhaps will be in danger of demolishing.
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