coal to oil的用法和样例：
- We are burning a "fossil", and we can refer in the same way to all natural organic materials, ranging from coal to oil and gas, including oil shales, tar sands, and other geological formation, as fossil fuels.
- We have enough coal to see the winter out.
- Conversion of your heating system from coal to gas will be costly.
- She uses tongs to add coals to the fire.
- Large acreages have been planted to oil crops.
- They burned coal to heat the room.