自然流失是城市水土流失的次要方面，城市建设产生的人为水土流失是城市水土流失的主体。
Artificial soil and water loss is the main aspect whereas the natural soil loss is only the secondary position in urban soil and water loss.
自然流失是城市水土流失的次要方面，城市建设产生的人为水土流失是城市水土流失的主体。
Artificial soil and water loss is the main aspect whereas the natural soil loss is only the secondary position in urban soil and water loss.
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