Definition: a hard, black substance that is dug from under the ground and burnt as fuel Level: C1
矿工从矿层中开采出一大块煤。
The miner extracted a large lump of ___coal from the seam.
在一些地区，煤仍然是发电的主要燃料。
In some regions, ___coal is still the primary fuel for electricity generation.
工业革命严重依赖煤作为燃料来源。
The industrial revolution was heavily dependent on ___coal as a fuel source.
