- The coal composition, coal evolution rank, coalbed distribution, thickness, burial depth and hydrocarbon generation feature were analyzed from coal feature in Tuha basin.
- We need to replenish our stocks of coal.
- She piled on more coal before the fire go out.
- I add the coal on the flame continuously.
- They are ventilating the sap of a coal mine.
- Prohibition was laid on the export of coal.