white chert

例句：

1. 1. The whitechert was used to make the statues.
   用白垩制作了这些雕像。
2. 2.The limestone cliff is a popular touristattraction.
   石灰岩悬崖是一个受欢迎的旅游景点。
3. 3. Thechalk in the classroom is perfectfor drawing.
   教室里的粉笔非常适合绘画。