名词
中文翻译：白垩石
同义词：
['limestone', 'chalk']
例句：
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1.The builders used limestone to build the walls of the castle.
建筑师们使用石灰石来建造城堡的墙壁。
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2.The chalk is white and can be easily washed off with water.
粉笔是白色的，用水很容易擦掉。
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3. Limestone is a common building material in many parts of the world.
石灰石是世界上许多地方常见的建筑材料。