名词
中文翻译：分级沉积物
同义词：
['grade sediment', 'graded sediment', 'graded sedimentary material']
例句：
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1.The riverbed is covered with a layer of graded sediment.
河床覆盖着一层分级沉积物。
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2. The study of graded sedimentary rocks is important for understanding the Earth's history.
研究分级沉积岩对于理解地球历史非常重要。
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3. The graded sediment in the lake indicates that the water level has been fluctuating recently.
湖中的分级沉积物表明最近水位有波动。