RUSLE is a field model, when using the model in watershed, properly determining topographic factor is crucial.

RUSLE是一个坡面模型，当将模型用于流域层次时，关键是地形因子的确定。

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Initial results indicate relief is the best topographic factor in assessment of regional soil and water loss.

初步研究表明，其中地形起伏度是区域水土流失评价的最佳地形指标。

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