At the beginning of heaven and earth, the source of all things, such as charcoal, such as coal, such as oil, such as peat. Coal is born in ancient wood, changed by the earth, and formed when it accumulates. Buried deep in the soil, the essence of the earth is accumulated, the color is black and heavy, and the burning is flaming. It can be used for cooking and heating, and it is also an important item for iron castings.

Oil, lying in the ground or out of the sea. Its quality is sticky, and its color is yellow or brown. When it is first obtained, it seems useless, and later generations understand its nature. Refining it can obtain all kinds of fuel oil, which can make cars and boats run, and it is also the basis of all kinds of chemical industry.

Peat, gathered in wetlands, piled up for the decay of grass and trees. It is loose in quality, rich in water, and can be burned when dry. Although its firepower is not as good as coal, it is also a source of heating in remote places.

These three, the root of the carbon base, are of great use in the world. Either for the needs of people's livelihood, or for the foundation of all industries, it is related to the livelihood of the world, and it must be important.