名词
中文翻译：白垩
同义词：
['limestone', 'calcite例句：1. The white slag is used as a building material.（白垩被用作建筑材料。）2. The limestone is mined from the nearby hills.（石灰石是从附近的山中开采的。）']
例句：
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1. The white slag is used as a building material.
白垩被用作建筑材料。
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2. The limestone is mined from the nearby hills.
石灰石是从附近的山中开采的。
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3. The calcite crystals are clear and transparent.
方解石晶体清澈透明。