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Unit Seven: Computer CommunicationsUnit Seven/Section AI. Fill in the blanks with the information given in the text:1. telegraph2. dots; dashes3. media4. point-to-point5. analog6. digital7. text-based8. modemII. Translate the following terms or phrases from English into Chinese and vice versa:1. microwave radio 微波无线电2. digital television 数字电视3. DSL 数字用户线路4. analog transmission 模拟传输5. on-screen pointer 屏幕上的指针6. computer terminal 计算机终端7. radio telephone 无线电话8. cellular telephone 蜂窝电话，移动电话，手机9. decentralized network 分散型网络10. wire-based internal network 基于导线的内部网络，有线内部网11. 光缆 fiber-optic cable12. 传真机 fax machine13. 无线通信 wireless communications14. 点对点通信 point-to-point communications15. 调制电脉冲 modulated electrical impulse16. 通信卫星 communication(s) satellite17. 电报电键 telegraph key18. 传输媒体 transmission medium (或media)19. 无绳电话 cordless telephone20. 金属导体 metal conductorIII. Fill in each of the blanks with one of the words given in the following list, makingchanges if necessary:Data communications is the process of transmitting and receiving data in an orderly wayso the data that arrives at its destination is an accurate duplication (复制) of the data that wassent. When data travels a short distance, such as when you send data from your computer toyour printer, it is referred to as local communications. When data travels a long distance, thecommunication is referred to as telecommunications; the prefix (前缀) “tele” is derived from aGreek word that means “far” or “far off.”The difference between a short distance and a long distance is somewhat arbitrary (武断的). For example, if your computer sends data to a printer in the next room, it is regarded aslocal communications; if you phone the person in the next room, you are transmitting dataover a telecommunications device. However, the same basic communications concepts applyto both local communications and telecommunications.Basic data communications concepts are the building blocks for understanding how datatravels on a communications system. These concepts come in handy (派得上用处) when youinstall, configure, or upgrade a local area network. In addition, these concepts help you set upmodems, fax machines, and cellular data transfers.IV. Translate the following passage from English into Chinese:个人计算机使用电信来提供传输链路，用于传送音频、视频、文本、软件和多媒体服务。
Internet 10信管陈海兰What is Internet? Internet is a worldwide and opening computer interconnected network.Basical functions:sending and receiving E-mail 收发邮件issue news 发布新闻Telnet 远程登录file transfer 文件传输information access 信息检索How the Internet began and developed?❖the first decade——facilitate E-mail ,support online discussion groups,allow access to distant databases,and support the transfer of files.❖during the early 1980s——be converted（修改) to the TCP/IP,the ARPANET became the backbone(支柱) of the new Internet.❖by the end of 1983——be born.TCP：传输控制协议IP：互联网协议ARPANET：阿帕网/互联网前身What about today?The internet has become a widespread medium for entertainment,information acquisition(信息获取）,electronic commerce（电子商务）,and interaction between individuals.What can you do using the Internet?➢You can communicate with other people throughout the world by means of electronic mail;➢read online versions of newspapers,magazines, academic journals,and books;➢join discussion groups on almost any conceivable topic;➢obtain free computer software.For commercial enterprises:to connect with one another and with customers. For businesses:to market and sell their products and services.●Nobody really owns it.●A pattern of usage of information and communicationstechnologies.●Every computer is part of a network.●A collection of huge corporate networks.●The routers determine where to send information fromone computer to another.The RoutersA router has two separate,but related jobs:•It ensures that information doesn't go where it is not needed.•It makes sure that information does make it to the intended destination.Some of the basic services available :◆E-mail（电子邮件）◆FTP（文件传输）◆Telnet（远程登录）◆Usenet news（新闻组网络）◆Use educational and information services(使用教育和信息服务)◆Access supercomputer sites（访问超级计算机站点）◆Access online library catalogs（访问在线图书馆）◆Access databases for teaching or research（访问教学或科研数据库）Keywords:❿acquisition 取得，获得，采集[,ækwi'ziʃən]❿bystander 旁观者，局外人['baɪstændə]❿clog v.阻碍n. 障碍；木底鞋❿conceivable 可能的[kən'siːvəb(ə)l]❿contractor 承包人，立约人❿cyberspace 网络空间，虚拟现实❿hyperlink 超连接❿navigate 导航❿transcend vt.超出，胜过[træn'send]excel [ik'sel]（in）在...方面胜过Her beauty transcends that of her younger sister.She excelled all other authors of her day.❿trillion 万亿['trɪljən]Notes:The World Wide Web(or Web) is one of the Internet's most popular services,providing access to over one billion Web pages,which are documents created in a programming language called HTML and which can contain text,graphics,audio,video,and other objects,as well as "hyperlinks"that permit a user to jump easily from one page to another.The World Wide Web(or Web) is one of the Internet's most popular services,providing access to over one billion Web pages,(1)which are documents created in a programming language called HTML and (2)which can contain text,graphics,audio,video,and other objects,as well as "hyperlinks"(3)that permit a user to jump easily from one page to another.The sun heats the earth , which makes it possible for plants to grow .（此句中，非限定性定语从句是对全句进行补充、说明,将全句表达的意思看成"一件事情）。
