名词
中文翻译：小圆石
同义词：
['pebble', 'cobblestone', 'pebble']
例句：
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1. The beach is littered with uncias of all sizes.
海滩上散布着各种大小的卵石。
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2. The old house had a few uncias in the front yard.
那所旧房子前院有几块卵石。
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3. He carefully placed an uncia on top of the book to protect it.
他小心地把一块卵石放在书上保护它。