3. Coal seams intermixed with iron ore . 煤层和铁矿混杂在一起。
英英解释
n.
1. fossil fuel consisting of carbonized vegetable matter deposited in the Carboniferous period
2. a hot fragment of wood or coal that is left from a fire and is glowing or smoldering v.
1. burn to charcoal
2. supply with coal
3. take in coal