众所周知,计算机在科学技术、生产、学习以及社会和家庭生活等各个领域正在发挥着日益重大的作用。计算机科学技术也在不断地发展和创新。在人们的印象中,一个CRT显示屏和一个键盘所组成的终端仿佛成了计算机的典型象征。然而仔细地想想,不停地操动键盘上的各个按键,输入程序和数据似乎也并不是一件轻松的工作。 It is well known that computers are playing an increasingly important role in various fields such as science and technology, production, learning and social and family life. Computer science and technology are constantly developing and innovating. In people’s minds, a terminal made up of a CRT monitor and a keyboard seems to be a typical symbol of a computer. However, think carefully, keep pressing the keys on the keyboard, enter the program and data does not seem to be an easy job.