计算机专业英语课件—unit 4

计算机专业英语——Computer ——Computer networking

教

师：地里拜尔

Unit 4 Computer networkingDiscussion: 你使用 过计算机网 络吗？如何 使用的？

TextA computer is a machine that processes data into information. Unless some human being needs the information, there is no point to processing the data. Without data, there is nothing to process. Input and output devices provide a means for people to access a computer.

Words in order to effectively solve environment devise imply mixture integrate form be discussed in include both…and… 为了 adv.有效地 vt.解决 n.环境，外界 vt.设计，作出(计划);n.遗赠 vt.暗示，意味 vt. n.混合，混合物 vt.使成整体；v.结合 n.形式，外形；v.形成，构成 被分为 vt.包含，包括 不但…而且…; 既…又…

TEXTThe physical components of a computer-the processor, memory, input devices, and output devices-are its hardware. You can see them, touch them, and feel them.

Software is a general term for programs. Software, in contrast, can not be seen, touched, or felt. It is a series of instructions that guides a computer through some process. Computer software can be divided into two very broad categories-systems software and applications software.

The former is often simply referred to as ‘systems’. These, when brought into internal memory, direct the computer to perform tasks.

The latter may be provided along with the hardware by a systems supplier as part of a computer product designed to answer a specific need in certain areas. Application programs also allow you to perform such tasks as solving statistical problems, keeping your company’s books or playing a computer game.

A computer is controlled by a stored program; thus, the first step in using the machine is copying the program from diskette into memory. Now, the processor can begin executing instructions. Input data from the keyboard are stored in memory. The processor manipulates the data, storing the results back into memory. Finally, the results are output.

A computer is a fast and efficient digital information processing system. It can accept, store, and process data and produce output results. It’s one of the greatest inventions in science and technology in the 20th century. It has had a long and deep social impact on human life and production.

Several computer generations occur in the history. The first digital computer ENIAC was invented in 1946. It marked the beginning of the first computer phase-mainframe phase. In fact, mainframes have had four generations of products, which are characterized by vacuum tubes, transistors, small and medium scale IC and super LSI circuits respectively.

In addition, the second-generation computers were given auxiliary storage, sometimes called external or secondary storage. Data were stored outside the computer on either magnetic tapes or magneti

c disks. Using magnetic tapes or magnetic disks for input and output operations increased the speed of the computer.

The keyboard,mouse, touch screen, light pen, bar codes which are widely used by supermarkets, microphone for voice input, and so on.

Practice: Practice:词语连线 VPN Mobile user Medium-sized Dial-access Affordable Password-protected Convert Implement Standalone ISP 中等规模 实现 虚拟专用网 密码保护 移动用户 拨号访问 转换 负担得起的 独立的 因特网服务供应商

HomeworkWriting: Network . In English . Use more than 120 words .