Coking coal is used in steel production.

煤被用于钢铁工业。

It produces 5m tonnes of coking coal a year.

每年，这个煤矿都会产出5百万公吨的焦煤。

Coking coal and steel production is one of the important raw materials.

炼焦煤是生产钢铁的重要原料之一。

The mines that supply one-third of the world's coking coal are shut down.

供给世界三分之一的焦炭停止生产，庄家被洪水糟蹋，土壤被洪水冲走。

Coking coal is a steel production process, one of the main raw material.

焦煤是钢铁生产过程中的主要原料之一。