As the most important invention in 20th century, computers play an important role in prople's daily life. It also applied widely in all aspect of our lives. As an old saying goes: "Every coin has its two sides". Along with the development of high technology more and more problems have been solved. However, there are also more and more problems brough to our attention. One of which is that people spend too much time on using computer and lose their health. Firstly, as we know, the ray of the monitor of computer is harmful for our body. Beside, staying too long in fornt of the computer is not benificial for people's eyes, either... --

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