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诠释“水上保持”概念，界定水土保持措施、水利措施、农业措施等的含义。说明水土保持措施在根治黄河中的作用。
Interpretation of the concept of “water conservation”, define the meaning of soil and water conservation measures, water conservancy measures, agricultural measures. Explain the role of soil and water conservation measures in eradicating the Yellow River.