The computer is a machine,it can't support you, like people. On the computer we print, play games. It can sit no more than 2 hours. The computer harms a person if you sit in it for a long time. This machine is useful for a person,it can help you with something,for example to find information.
Ошибки в тексте возможно имеются,я не знаток английского языка.