菜篮子兴趣思朗文词典

ripple marks

R 开头单词

柯林斯词典

    ripple mark

  • 1. N one of a series of small wavy ridges of sand formed by waves on a beach, by a current in a sandy riverbed, or by wind on land: sometimes found fossilized on bedding planes of sedimentary rock 波痕

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