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.

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在干旱地区，风是侵蚀的主要因素。

In dry areas, the wind is the principal agent of erosion.

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天气以多种形式作为侵蚀的主要因素。

The weather, in its many forms, is the main agent of erosion.

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