名词
中文翻译：Unknown
同义词：
['grain', 'grit', 'pebble', 'gravel', 'sandstone']
例句：
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1.The grains of sand are being washed away by the tide.
沙子粒被潮水冲走了。
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2.The pebbles on the beach are a reminder of the harshness of the ocean.
海滩上的鹅卵石提醒我们海洋的严酷。
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3. The sandstone formations in the park are breathtaking.
公园里的砂岩形成物令人惊叹。