双层堤基在大江大河防洪干堤中非常普遍。
Levee double - layer foundation is very common in levees along large rivers.
这些认识对深化大江大河的成因理论具有重要的意义。
Those recognitions will make significance to deepen genetic theory on large river.
小流域是大江大河的基本单元，也是长江流域水土流失治理的重点。
Watershed is the basic portion of the great river, the stress of the water and soil erosion management.
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