Computers can injure you. Most other injuries happen suddenly.For
example,if you fall off a bike and break your arms, it happens very
quickly. But computer injuries happen slowly.
You probably know how to ride a bike safely.Now learn to use a
computer safely.
Your eyes
Too much light can injure your eyes, so never sit too close to a
computer screen. Your eyes should be at least 50cm from the screen
Remember to look away from it sometimes. This gives your eyes a rest.
When you use a computer, the window should be on your left or your
right.If it is behind you, the light will reflect on(反射) 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.
Enjoy your computer, but use it safely.

6. A computer screen may injure your eyes if your eyes are too close to it.
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7.Hand and wrist injuries are caused when you get plenty of exercise.-
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8. Your eyes and hands will be safe if you often take rests from working.-
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9.It is good for your back and neck if you sit in the right way._

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10.The best title for the text Would be How to Protect Your Eyes
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