They are the backbone of the new generation of national air defense skynet, and they are the expression of discussion. Discussion refers to the author's comments on a discussion object to show his views and attitudes. Its function is to make the article clear and profound, with strong philosophical and theoretical depth. In argumentative writing, it is the main expression. They are the backbone of a new generation of national air defense skynet, which is my opinion, affirmation and my own view and attitude. Therefore, they are the backbone of a new generation of national air defense skynet.