![](https://csdnimg.cn/release/download_crawler_static/87076701/bg4.jpg)
the screen. If the window is in front of you, the sun and the
screen will both shine into your eyes.
Your hands and wrists
Hand and wrist injuries can happen because the hands and
wrists are moved in the same way hundreds of times. If you use
a keyboard for a long time,follow these three rules:1) Rest your
wrists on some thing. 2) Keep your elbows (肘) at the same
height as the keyboard. 3) Stop sometimes and exercise your
hands,wrists and fingers in a different way.
Your back
Some people sit for many hours in front of a computer. If
you sit in the wrong way,you can injure your back or your neck.
So you should sit with your back straight. The top part of the
screen should be in front of your eyes. Your forearms,wrists,
hands and the upper part of your legs should all be parallel (平
行) to the floor. If you are sitting for a long time,get up every 30
minutes and exercise your arms,legs and neck.