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双重堤防
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双重堤防
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双重堤防
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double embankment system
双重堤防
明代治河专家潘季驯为实现“束水攻沙”目标,总结前人经验,在黄河下游徐州至海口两岸建设的堤防工程系统。
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Moral Science
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Morals from Motives
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