个人计算机中英文翻译.doc

PAGE PAGE 5 Personal computer What is personal computer There have been many kinds of computer systems according to their size,such as su- percomputers,mainframe computers ,minicomputers and personal computers.Superco- mputers are special,high capacity computers used by very large organization principa lly for research purposes ,among which are oil exploration and worldwide weather fo- recasting .Mainframe computers (or mainframes )are large,powerful computers that many people can use at the same time .They are also expensive systems that are used for very large processing tasks and perform many important business and government applicatoions .Minicomputers are smaller and more compact systems ,and fewer opra- tors can use them compared with a mainframe computer .They are usually found in m edium-size businesses or in divisions within a large organization ,for example in gov- vernment department. Personal computers-also called microcomputers-are small,self-contained computers that fit on a desktop and usually only used by one person.they are the least exepensiv e type,and are widely used in business for a business for a variety of tasks,such as wor d –processing ,small database management ,and spreadsheets.They are also used as ho me computers,for family budgeting and similar jobs,as well as for games. Protable compuers Another important development in personal computer technology is that the portabl e computers have been widely used .A small , portable personal computer is light and small enough to hold on your lap. The computer is smaller than a luggage but larger th an a notebook,and is also called a laptop or notebook computer .A portable computer usually weighs between three to eight pounds,and when folded shut is about the size o f a small briefcase .So it offers the user considerable freedom. The user can work his computer on train ,or on an airplane ,or on safari in Africa. Portable computers can be plugged in or run on batteries,although