With the appearance of printers, the pen becomes less useful than before. And since the computer was created, paper is also gradually giving way to the screen, which can show lively moving things from different sides in the same picture. It is true that with the developmem of science, such products as computers and printers will be the major tools in our future life and work. But the traditional tools will also exist for a long time to supplement the function of the modern ones. At least, we still need pens to sign with and paper to sign on.