Limestone is a whitish-coloured rock which is used for building and for making cement. 石灰岩
noun [专属名词] [岩] 石灰岩
The area is being quarried for limestone. 这地方正在开采石灰石。
- limestone 出现在下面的课文中（提供视频、音频及笔记等可系统性学习）
- Lesson 42 Modern cavemen limestone 名词: 石灰石
