The extreme seriousness of desertification results from the

The extreme seriousness of desertification results from the vast areas of land and the tremendous numbers of people affected,as well as from the great difficulty of reversing or even slowing the process.Once the soil has been removed by erosion,only the passage of centuries or millennia will enable new soil to form.In areas where considerable soil still remains,though,a rigorously enforced program of land protection and cover-crop planting may make it possible to reverse the present deterioration of the surface.
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中文意思要说的通顺 要能理解的
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如此严重的沙漠化是受到地域的庞大和巨大人口数量的影响,还有扭转甚至减缓这个过程的巨大困难导致的.一旦土壤被侵蚀,只有通过几百或者几千年才能形成新的土壤,虽然说,在大量土壤还存在的地区,严格执行土地保护和覆盖作物的种植可能会扭转目前的表面恶化.