名词
中文翻译：Unknown
同义词：
['pebble', 'cobblestone', 'gravel']
例句：
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1. The riverbed is covered with smooth pebbles.
河床覆盖着光滑的卵石。
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2. He carefully placed the large cobblestones on the ground.
他小心翼翼地把大卵石放在了地上。
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3. The gravel was packed tightly, making it difficult to walk on.
砾石紧密地铺在一起，很难走。