Knowledge stored as mental fat is useless, but it is useful only when it becomes mental muscle. Spencer

I have never worked in my life. My humor and great works all come from asking for help from the endless treasure in the subconscious. -Mark Twain

Solving the problem of language evolution is as difficult as solving the mystery of species evolution; The evolution of language is not only a social phenomenon, but also a natural phenomenon, and it is also the result of human psychological development and historical and cultural evolution. Because the origin and change of language has its internal causes and external influences, it increases the complexity of language evolution. Zhou Haizhong