Definition
白垩 (bái è) refers to chalk as a soft white limestone made of calcium carbonate, used in geology and industry. It is distinct from 粉笔 (fěn bǐ), the chalk sticks used for writing on blackboards. You'll also see it in 白垩纪 (bái è jì), the Cretaceous period.
n.
chalk (calcium carbonate, soft limestone)
Examples
- 白垩。Zhè zhǒng bái è zhǔyào yòng yú gōngyè hé jiànzhù.This kind of chalk is mainly used in industry and construction.
- 。Kǒnglóng zài bái è jì fēicháng fánshèng.Dinosaurs flourished in the Cretaceous period.
- 白垩。Kēxuéjiā zài yáncéng zhōng fāxiàn le dàliàng bái è.Scientists discovered a large amount of chalk in the rock layers.
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