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The development and evolution of sea bottom sand ridges and sand ripples are discussed.
讨论了海底沙脊和沙波发育演变问题。
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The central area is characterized by many lakes, bogs and low ridges.
中部的平原地带以众多的湖泊，沼泽和低岭为特点。
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The central area is characterized by many lakes, bogs and low ridges.
中部的平原地带以众多的湖泊，沼泽和低岭为特点。
youdao