在造成草地退化的众多因素中，可控因素主要有过度放牧、垦殖、樵采以及政策的导向。
There were many factors contributing to the grassland degeneration, but some were artificial control and others were not.
在造成草地退化的众多因素中，可控因素主要有过度放牧、垦殖、樵采以及政策的导向。
There were many factors contributing to the grassland degeneration, but some were artificial control and others were not.
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