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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。
youdao
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Dunes are ridges of loose sand heaped up by the wind.
沙丘是散沙被风吹起堆积而成的。
youdao
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Dunes are ridges of loose sand heaped up by the wind.
沙丘是散沙被风吹起堆积而成的。
youdao