Obviously computer is one of the most important technology and object in our society now.Go back to the old time,computer was very huge and heavy.It's also hard to use.But now when Bill Gatz made windows,the computer beacme very useful and easy to handle.Now people use a kind of computer called laptop,it's really light and easy to carry with it.People now use it to communite,searching information,play games,write assignment,doing their projects.etc.Most of them are done by the internet.The material of a computer would be iron,plastic,glass.etc,and electric is needed.
不知道你要多少字,所以就打了这些.