Partially, it is caused by natural factors, such as topography and climate, and partially it is man-made, such as excessive grazing and the improper development and utilization of water resources, which has caused the withering of oases.
英
美
释义
有些是自然原因如地形、气候造成的,有些则是人为原因造成的,如草原过度放牧,不适当开发利用水资源造成绿洲萎缩等。
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