名词
中文翻译：Unknown
同义词：
['pebble gravel', 'cobblestone']
例句：
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1. The beach was littered with small pebbles and large flint gravel.
海滩上散布着小鹅卵石和大砾石。
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2. The riverbed is covered in smooth cobblestones.
河床覆盖着光滑的鹅卵石。
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3. The path was paved with smooth cobblestones for easy walking.
小路铺满了光滑的鹅卵石，便于行走。