土壤侵蚀是土地退化的主要原因，也是导致生态环境恶化的最严重的问题，联合国粮农组织将其列为全球土地退化的首要问题。
Soil erosion is the main cause for the global land degradation and also is the key problem resulting in the ecological environment deterioration, so N. n.
土壤风蚀是全球性土地退化的主要原因之一，也是世界上许多国家和地区的主要环境问题之一。
Soil erosion is a global one of the major causes of land degradation, but also many of the world's countries and regions, one of the major environmental problems.
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