草地退化的SRYYR所造成的综合影响，人为和自然因素的影响。
Grassland degradation in the SRYYR is caused by the integrated effect of anthropogenic and natural factors.
于是欧洲兔子遍及整个澳洲大陆。它们掘洞挖穴，滥食牧草，造成草地的严最破坏，使数百万头牛羊无以为生。
It overran a whole continent. It caused devastation by burrowing and by devouring the herbage which might have maintained millions of sheep and cattle.
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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