How to look on a new invention---computer

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Nowadays,as we all know,with the development of science and technology,computers are being widely used in our daily life .and believe it or not,there are almost seven out of ten families in the world that have a computer at home . with computers,we can do a lot of things conveniently .For example,we can communicate with one another .And we also enjoy ourselves by listening to music,watching movies online .Besides,we can also do shopping on the internet .What's more important,we are always kept informed of what's going on both at home and abroad with the help of the computers . But does it mean that computers can bring us all good effects,and so side effects at all?