英语学习资料：如何保护您的视力(How to Protect Your Eyesight)

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　　second, pay attention to the following: don't read in the sun or in a poor light; don't read in bed or in a moving bus. and when you read you should keep the book away from your eyes for about a foot.and third, do eye-exercises every day. it will also help you keep good eyesight.

　　if you obey the rules above, i think, you may prevent your eyesight from being short-sighted.