The computer is fast and hardly makes a mistake, while people are slow and make mistakes sometimes. That’s what people often say when they talk about computers. For many years, scientists have been improving computers. Now a computer can do a lot of everyday jobs wonderfully. It is widely used in factories, hospitals, post offices and airports. A computer can report, decide and control in almost every field(领域). With the help of a person, a computer can draw pictures, write music, talk with people, play chess, translate languages and so on. Many computer scientists are now thi