应用卫星影像信息可提取影响土壤侵蚀因素的种类及量级，但不能直接提供土壤侵蚀的数量。
By using satellite vedio information, the types and grades influenced soil erosion factors could been drawn out, but the quantities of soil erosion could't been provided directly.
降雨是影响土壤侵蚀的关键因素。
土壤侵蚀是造成环境退化的一个主要因素。
Soil erosion is a major factor of causing environmental degradation.
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