The ancient Greek philosopher Thales has a famous saying: "Water is the source of all things"; water is the source of all things and the material basis for the survival of all living things. Some scholars once estimated the water content of all living things on the earth. , almost half of the fresh water on the earth's surface. The water content of all living things on the earth = 1/2 the fresh water on the earth's surface. Almost all living things on the earth contain water in their bodies, and they will die due to lack of water. So in this sense , "Life is water, water is life." Cherishing water means cherishing life.