名词
中文翻译：Unknown
同义词：
['pebble', 'pebbly', 'cobblestone例句：1. The riverbed is littered with small stones.（河床上散布着小石头。）']
例句：
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1. The riverbed is littered with small stones.
河床上散布着小石头。
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2.She picked up a pebble and tossed it into the water.
她捡起一块卵石，扔进水里。
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3.The cobblestone path was worn smooth by years of foot traffic.
鹅卵石铺成的小路因多年的行人踩踏而变得光滑。