建立了延庆县旅游生态环境质量评价体系。
Tourism eco-environmental quality evaluation system of Yanqing was established.
漓江的旅游业效应，对于遇龙河的生态环境也构成了潜在威胁。
The effect of tourism on the Li River is also a potential threat to the environment along the Yulong River.
国外对选择性旅游的研究主要集中在对其涵义的理解和其给旅游接待地的经济、社会文化及生态环境造成的影响方面，尤其是经济方面。
The research about alternative tourism abroad focuses on the understanding of its meaning and its effect on economy, social culture and environment of tourism destination, especially on economy.
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