名词
中文翻译：白垩
同义词：
['limestone', 'calcareous stone']
例句：
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1. The white ash fromthe fire is a natural material that canbe used for building.
火灾中的灰烬是一种天然材料，可以用来建造。
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2. The limestoneformations in the area are famous fortheir unique texture and color.
该地区的石灰岩形成物以其独特的纹理和颜色而闻名。
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3. The white ash from the firewas collected and used to make bricks.
火灾中的灰烬被收集起来，用来制作砖块。