大平原上的大片草原由于过分放牧而逐渐荒芜。
Vast regions of grasslands on the Great Plains were depleted by overgrazing.
导致沙漠化的主要因素有四个：过度种植，过度放牧，过分砍伐，过度灌溉。
Four specific activities have been identified as major contributors to the desertification processes: overcultivation, overgrazing, firewood gathering, and over irrigation.
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