新视野大学英语第4册unit4教案.docx

1、新视野大学英语第4册unit4教案Chinas telecommunications industry has seen revolutionary transformation and growth over the past three decades. Chinese Internet users number nearly 150 million, and the PRC expects to quickly pass the US in total numbers of connected citizens. The number of mobile and fixed-line t

2、elephone users soared from a mere 2 million in 1980 to a total of nearly 800 million in 2007. China has been the most successful developing nation in history for spreading telecommunications access at an unparalleled rapid pace.The Telecommunications Revolution 背景知识(background info)The Telecommunica

3、tions Revolution 1. telecommunications: Telecommunications, from Greek, means “communications at a distance”. Telecommunications through voice, data, and image communication is changing the world. The ease of accessing information and people anywhere at anytime is having major impacts on society, bu

4、siness, and finance. Two major trends have occurred in the technology that is applicable to telecommunications. The first trend has been the incredible increase in the processing power of digital computers, namely, dramatic decreases in physical size along with equally dramatic increases in complexi

5、ty, speed, and capacity. The second trend has been the explosive growth in transmission capacity through the widespread use of optical fiber across continents and under oceans. These two trends have had impressive long-term consequences for telecommunications around the world. The Internet and the W

6、orld Wide Web have already created a global system for the access of information. It has become popular that people check flight, weather, and hotels before traveling to a foreign country. E-mail makes it easy to keep in contact instantly with colleagues and friends around the globe. But many of the

7、 peoples of the world do not even have a telephone, much less access to the Internet and the information. The challenge to the telecommunications industry is to bridge the digital gap and extend the availability of telecommunications to all parts of the planet. For an introduction to the fundamental

8、s of telecommunications, please check out the websites at and http:/www.iec.org/online/tutorials/fund_telecom/. Another easy-to-understand telecommunications primer can be found at http:/www.ceci.org/500/primer.html. 2. optical fiber: Optical fiber (or “fiber optic”) often refers to the medium and t

9、he technology associated with the transmission of information as light pulses along a glass or plastic wire or fiber. Optical fiber carries much more information than conventional copper wire and is in general not subject to electromagnetic interference and the need to retransmit signals. Most telep

10、hone company long-distance lines are now of optical fiber. Transmission on optical fiber wire requires repeater at distance intervals. The glass fiber requires more protection within an outer cable than copper. For these reasons and because the installation of any new wiring is labor-intensive, few

11、communities yet have optical fiber wires or cables from the phone companys branch office to local customers (known as local loop). Single mode fiber is used for longer distances; multimode fiber is used for shorter distances. Please visit and for more information on optical fiber.3. information age:

12、 When we say that we live in the information age, we mean that we live in a time when information is very important and easy to get. The information age is an era of fundamental and global change in intellectual, philosophical, cultural and social terms. Todays information age began with the telegra

13、ph. It was the first instrument to transform information into electrical form and transmit it reliably over long distances. New techniques of encoding and distributing digital information are pacing the spread of the information age throughout society. For a historical perspective on the information

14、 technology, check out the websites at http:/www.si.edu/resource/faq/nmah/techhistory.htm and http:/photo2.si.edu/infoage/infoage.html. The web page at http:/www.libraries.psu.edu/crsweb/infolit/andyou/mod9/infotech.htm provides extensive links to issues related to the information age. For a discuss

15、ion of China in the information age, check out the paper at http:/www.sims.berkeley.edu/pam/papers/chinaip.html. 4. information superhighway: A name first used by (former) U.S. Vice President Al Gore for the vision of a global, high-speed communications network that will carry voice, data, video, an

16、d other forms of information all over the world, and that will make it possible for people to send email, get up-to-the-minute news, and access business, government and educational information. The Internet is already providing many of these features, via telephone networks, cable TV services, onlin

17、e service providers, and satellites. In the U.S., the information superhighway is also known as National Information Infrastructure (http:/glossary.its.bldrdoc.gov/fs-1037/dir-024/_3476.htm). The information superhighway can be understood to be a highway which has computer technology and modern comm

18、unication technology serving as the base of the road and fiber-optic cables serving as the surface of the road. The “vehicles” are the multimedia machines equipped with computer, television and telephone, and high speed transmission and exchange of various multimedia information forms the web coveri

19、ng the whole nation. If the national superhighways all over the world are linked together, the global information superhighway will be created. Who first created the idea of “constructing” a superhighway? In 1955, Albert Gore, then Tennessee Democratic senator, put forward in the U.S. Congress the a

20、ct of interstate superhighway, which was later proved to have greatly promoted the American economic development. In 1991, his son, Al Gore, proposed another act high performance computing act, HPCA (http:/www.hpcc.gov/congressional/laws/pl_102-194.html). For the first time, HPCA demanded high perfo

21、rmance computer and communication. The core of the act is to set up a national research and education network, NREN. For more information on the subject, check out the websites at http:/trochim.human.cornell.edu/gallery/abrahams/ish.htm, http:/admin.engr.wisc.edu/IT/infohghy.cfm and .au/http/sfist/s

22、hwy0.htm.5. BellSouth Corporation: BellSouth is a telecommunications company in the U.S. that mainly serves the southern states. Its business ranges from voice (such as local and long-distance telephone and wireless) to data (computer networks) services. For more information about the company, check

23、 out its website at .The Telecommunications Revolution 课文生词讲解( new words study)The Telecommunications Revolution New Wordstelecommunications n. Uthe sending and receiving of messages over distance, esp. by telephone, radio and television 电信，远距离通信a telecommunications satellite 长途通信卫星the telecommunica

24、tions industry 电信业The company specializes in telecommunications. 这家公司专门从事长途通信。 dumb a. lacking the power of speaking; unable to speak 哑的，不会说话的He was struck dumb with fear. 他吓得说不出话来。The prisoner remained dumb throughout his trial. 整个审判期间犯人一言不发。 utility n. 1. C a service used by the public, such as an

25、 electricity or gas supply or a train service 公用事业，公用事业设施a public utility 公用事业公司high utility bill 高额公用事业开支2. U the usefulness of sth., esp. in a practical way 功用，效用，利用Some kitchen tools have very little utility. 有些厨房用具几乎没有什么用处。The utility of this rescue equipment has still to be assessed in a real e

26、mergency. 这种救生设备的功用还有待在真正的紧急情况中评定。 optical a. 1.of or using light, esp. for the purpose of recording and storing information for use in a computer system 光学的，光的an optical fiber光学纤维Telescopes and microscopes are optical instruments. 望远镜和显微镜都是光学仪器。2.of or about the sense of sight; visual 视力的，视觉的，眼睛的an

27、 optical effect 视觉效果He suffers from an optical defect. 他有视觉障碍。 diameter n. C the (length of a) straight line that goes from one side of a round object to another, through the center of the object 直径The diameter measures twice the radius. 直径为半径的两倍。The pond is six feet in diameter. 该池塘直径为6英尺。 millimet

28、er n. C a unit of length which is equal to 0.001 meter 毫米A millimeter is one-thousandth of a meter. 一毫米是一米的千分之一。 cable n. C (a length of ) wire, esp. twisted into thick strong rope or used to carry electricity 缆索，电缆There were cables used for telephones, lights and computers all over the floor. 地上满是电

29、话、电灯、计算机的线缆。The road has been dug up in order to lay cables. 路被挖开以便铺设电缆。 copper n. U a soft reddish metal that is a simple substance that is easily shaped and allows heat and electricity to pass through it easily紫铜，紫铜色a bracelet made of copper 铜制手镯a. made of copper, reddish-brown color 铜的，铜色的copper

30、wire / pipes 铜线/铜管Her hair shone copper in the sunlight. 她的头发在阳光下闪着紫铜色。 parade n. 1. C a series of people or things that seems never to end 一连串，一批an endless parade of advertisements 一连串没完没了的广告When I asked him about his childhood, he remembered a parade of baby-sitters. 当我问起他的童年时，他记起了一大批保姆。2. C a lin

31、e of people, vehicles, etc. moving forward in order, often as a celebration of some event （庆祝）游行，检阅The small boy loves watching the soldiers on parade. 这个小男孩喜欢看士兵的检阅队伍。The crowd marched through town in a victory parade. 人群游行走过市中心，欢庆胜利。 spider n. Ca small insect-like creature with eight thin legs 蜘蛛a spiders web 蜘蛛网Spiders produce fine threads which they make into webs in order to trap insects for food. 蜘蛛用