英语翻译A computer is a machine designed to perform work mathema

英语翻译
A computer is a machine designed to perform work mathematically and to store information that has been fed into it.It is run by either mechanical or electronic means.These machines can do a great deal of calculation work in a very short time.A large computer' for example' can add or subtract nine thousand times a second' multiply a thousand times a second' or divide five hundred times a second.Its percentage of error is about one in a billion digits while the percentage of error by human-beings is about one in two hundred digits.
The heart of an electronic computer lies in its transistors.Its electronic circuits work a thousand times faster than the nerve cells in the human brain.A problem that might take a human being two years to solve can be solved by a computer in one minute' but in order to work properly' a computer must be given instructions--it must be programmed.
Computers can be designed for many specialized purposes--they can be used to guide airplane flights' direct traffic' even to play chess.Computers play an important role in modem plants and factories throughout the world.