Forest vegetation moisture is one of natural ecological factors, which is the main factor to decide forest fire danger.
森林植被湿度作为一个自然生态因素，是决定森林火险的主要因子。
The evaluation result showed that Zhangjiajie tourism environmental quality was overall very good and the natural ecological environment was biggest factor affecting the tourism environmental quality.
结果显示：张家界旅游环境质量总体上是好的，自然生态环境对旅游环境质量影响最大。
The water is the foundational natural resource and the strategic economical resources, and it is the essential factor of ecological environment.
水是基础性的自然资源和战略性的经济资源，是生态环境的控制性要素。
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