名词
中文翻译：石头
同义词：
['stone', 'limestone']
例句：
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1. The ancient city is surrounded by a large limestone hill.
这个古老的城市被一座大型石灰岩山所包围。
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2. The limestone quarry is located in the mountains.
石灰岩采石场位于山区。
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3. Limestone is used to make bricks and tiles.
石灰石用于制作砖块和瓷砖。