名词
中文翻译：Unknown
同义词：
['pebble', 'cobblestone', 'gravel']
例句：
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1. The river is lined with smoothpebbles.
河岸边铺满了光滑的卵石。
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2. The old house was built ona bed of gravel.
那座老房子建在砾石上。
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3. The stones were arranged ina pattern that looked like a cobblestone path.
这些石头被排列成一条看起来像鹅卵石小径的样子。