do you always sit before computer for a long time?

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since computer comes to the world,the lives of many people change a lot.many young students start to play computer earlier than their parents.through computer you can talk with your friend who and you are not in the same place.you can kown about the world quickly. several months ago my parents bought me a pc ,since that i always sat before computer for a long time,after that sometimes my eyes would be in pain and my waist would be under the weather . what about you ? how long do you always sit before computer?