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山区作为一个特定区域，一般是指一个山脉或水系组成的自然空间区域。山区资源丰富，是生物多样性的重要场所，但又是MI对落后、贫困的地区；同时山区又大多位于非山区的上游，是主要河流和水系的源头。因此，山区资源的合理利用和保护是广大下游地区良好发展环境的前提和基础?
A mountainous area as a specific area generally refers to a natural area of mountains or waterways. Mountainous area is rich in resources and is an important place for biodiversity, but it is also an area where MI is backward and impoverished. At the same time, most of the mountainous areas are located upstream of non-mountainous areas and are the source of major rivers and water systems. Therefore, the rational use and protection of mountain resources is the premise and basis for the good development environment of the vast majority of downstream areas?