名词
中文翻译：白垩石
同义词：
['limestone', 'chalk例句：1. The ancient city is covered with layers of white limestone.（这个古老的城市被厚厚的白垩石层覆盖。）2. The builders used limestone to build the walls.（建筑师们用石灰石来建造墙壁。）3. The limestone formations are a wonder of nature.（石灰石的形成是大自然的奇迹。）']
例句：
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1. The ancient city is covered with layers of white limestone.
这个古老的城市被厚厚的白垩石层覆盖。
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2. The builders used limestone to build the walls.
建筑师们用石灰石来建造墙壁。
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3. The limestone formations are a wonder of nature.
石灰石的形成是大自然的奇迹。