Computer's role nowadays
We can say that the computer is a very useful thing nowadays. If there was not the computer, we couldn't for example check our work, learn some new information, read books,watch films, even install something.
 But the last time it became dangerous to use computers. There are a lot of viruses, 
obsession advertisement, threats.
Even a lot of people use computers to play games, communicate with other people, listen to music... but for too long. Some people sit at the computer, for hours,days, even weeks!
They become dependent on the computers!! They are not normal people any more, and must be cured.
So we see that the computer, can be very useful, can be dangerous, and all we have to do, not tobe depent on it, just use it for studing,reading at least listening to music.. But not not beeing with computer for days any more!!