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The computer is a useful machine。 I can not only help us work， but also offer us all kinds of games。 But if we spend too much time sitting in front of the computer， our eyes will become worse and worse。 We may even forget how to read and write。

I think we are the owners of computers，and we must also be the owners of ourselves。 It is important to know when to use computers。 That means to control computers but not to be controlled by computers。