It is a normal natural phenomenon that people have birth, illness, death and illness. Not only human beings, but all life, until everything, always has a beginning. In fact, the universe we live in will eventually die out-of course, this process is extremely long. Isn't there an old saying that "the old don't go, the new don't come"? Life is fragile. We have to face diseases, accidents and disasters, but life is hard. One life disappeared and another new life took its place. Human beings will continue from generation to generation, and society will continue to develop. In this sense, human society is also a metabolic organism. Human death, like human birth, is the need of social continuity. On the other hand, if we humans only lived and died, the earth would have been crushed.