Because FIFA's slogan is fair play, that is, fair play, children are innocent, there is no intrigue, it is a symbol of fair play, and children are also the hope of the future, so they always bring the national anthem with them when singing. The general league is not, only the official competition between national teams will appear. Fifa stipulates that in order to make the football concept deeply rooted in the hearts of the people, all international A-level football matches and some important football matches must bring caddies into the arena, regardless of gender.