| 释义 |
白垩bái'è石灰岩的一种,主要成分是碳酸钙,是由古生物的骨骼积聚形成的。白色,质软,分布很广,用做粉刷材料等。{chalk; type of soft, white limestone, mainly calcium carbonate, formed by accumulation of remains of ancient organisms, widely distributed, used for whitewashing;}通称also白土子{báitǔ·zi},大白{dàbái}。 |