名词
中文翻译：沙丘滚动
同义词：
['sand drift', 'sand ripple', 'sandwave']
例句：
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1. The wavesof the sea are constantly rolling over theshore.
海浪不断地在岸边翻滚。
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2. The sand rolleris a machine that rolls sand into shape.
沙子压平机是一种将沙子压成形状的机器。
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3. The sand roller was used tolevel the beach before construction began.
在施工开始之前，沙子压平机被用来平整沙滩。