名词
中文翻译：Unknown
同义词：
['rock', 'pebble', 'gravel', 'cobblestone']
例句：
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1. The riverbed is covered in small stones.
河床上铺满了小石头。
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2. The road was paved with large rocks and small stones.
这条路是用大石头和小石头铺成的。
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3. The builders used gravel to level the ground.
建筑工人用碎石平整地面。