What do you mean, one side supports the other?

One side of the soil and water supports one side of the people: it is a common saying, which means that a certain environment has created a certain number of talents.

People in different regions have different cultural characteristics because of their different living environment, different lifestyles, different geographical climate, different ideas, different humanities and history, and different ways of treating people. In order to adapt to the local environment and survive for a long time, people have formed certain living habits and ways.

It is cold in winter in northern areas. In order to resist the cold, northerners often eat greasy food.

Because of the humid climate in Sichuan. Eating Chili peppers can make people's heart beat faster, their pores widen, their skin capillaries dilate and thicken, their blood speeds up, their sweat glands open, and the cold and moisture on their bodies are easily driven out of the body.

In a word, the survival of the fittest. Change for survival.