• The second, the crest sand is coarser but still better sorted than any other position of dunes in the banks of the Yellow River.

    其二黄河两岸阶地和湖盆滩地新月形丘丘顶沙粒粗其它部位分选仍然最好

    youdao

  • The second, the crest sand is coarser but still better sorted than any other position of dunes in the banks of the Yellow River.

    其二黄河两岸阶地和湖盆滩地新月形丘丘顶沙粒粗其它部位分选仍然最好

    youdao

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