名词
中文翻译：粗粒石
同义词：
['coarse sandstone', 'coarse gravel', 'coarse gritstone']
例句：
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1. The riverbedis covered in coarse-grained stones.
河床覆盖着粗粒石。
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2.Coarse-grained stones are often used for construction.
粗粒石通常用于建筑。
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3. The builders had to remove the coarse-grained stones before starting the new project.
在开始新项目之前，建筑工人必须移除粗粒石。