Very many people often use computer. Somebody play computer games. Somebody use it for work or school. But if you will spend a lot of time at the computer, your vision will deteriorate and so on.
To spend time at the computer, you have to know regulations:
1. You can use computer 30-40 minutes.
2. The distance from the head to the computer should be 50 centimeters.
3.Your posture should be flat.
Точный перевод на уровне 7 класса. :з