名词
中文翻译：Unknown
同义词：
['pebble', 'gravel', 'cobblestone']
例句：
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1. The riverbed was covered with a layer of smooth pebbles.
河床覆盖着一层光滑的卵石。
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2. The old house had been left with only the smallest pebbles for steps.
这座老房子只剩下最小的卵石作为台阶。
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3. The cobblestone path led to the main square.
鹅卵石铺成的小路通向主广场。