名词
中文翻译：白垩
同义词：
['limestone', 'chalk', 'lime']
例句：
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1.The builders used limestone to build the walls of the house.
建筑工人用石灰石建造了房子的墙壁。
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2. Limestone is a common material used in construction.
石灰石是建筑中常用的材料。
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3.The white color of limestone is due to its high calcium content.
石灰石的白色是因为其高钙含量。