名词
中文翻译：粗砂
同义词：
['crude sand', 'coarse gravel', 'coarse earth']
例句：
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1.The builders were busy shoveling the coarse mull to make room for the new road.
建筑工人忙着用粗砂填平空地，为新路腾出空间。
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2.The farmer used coarse mull to enrich his soil.
农民用粗砂来改良土壤。
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3. The coarse mull was a great help in making the construction site more accessible.
粗砂在使工地更加便利方面起到了重要作用。