名词
中文翻译：碎石
同义词：
['cobble', 'cobblestone']
例句：
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1.The road was covered with gravel to prevent slipping.
为了防滑，道路铺满了碎石。
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2.The builders used gravel as a base for the new road.
建筑工人用碎石作为新路的基础。
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3. The gravel in the riverbed is very fine and smooth.
河床中的碎石非常细且光滑。