The geologist identified the rock sample as clarain.

地质学家鉴定出这块岩石样本是亮煤。

Clarain is often used in the production of high-quality coke.

亮煤常用于生产高质量的焦炭。

The miner extracted a large piece of clarain from the coal seam.

矿工从煤层中开采出一大块亮煤。

Researchers are studying the properties of clarain to improve its use.

研究人员正在研究亮煤的特性以改进其用途。

The presence of clarain in the coal deposit indicates a rich resource.

煤矿中亮煤的存在表明资源丰富。