新视野大学英语第4册unit4教案文档格式.docx

新视野大学英语第4册unit4教案文档格式.docx

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Opticalfiber（or“fiberoptic”）oftenreferstothemediumandthetechnologyassociatedwiththetransmissionofinformationaslightpulsesalongaglassorplasticwireorfiber.Opticalfibercarriesmuchmoreinformationthanconventionalcopperwireandisingeneralnotsubjecttoelectromagneticinterferenceandtheneedtoretransmitsignals.Mosttelephonecompanylong-distancelinesarenowofopticalfiber.Transmissiononopticalfiberwirerequiresrepeateratdistanceintervals.Theglassfiberrequiresmoreprotectionwithinanoutercablethancopper.Forthesereasonsandbecausetheinstallationofanynewwiringislabor-intensive,fewcommunitiesyethaveopticalfiberwiresorcablesfromthephonecompany'

sbranchofficetolocalcustomers（knownaslocalloop）.Singlemodefiberisusedforlongerdistances;

multimodefiberisusedforshorterdistances.Pleasevisitandformoreinformationonopticalfiber.

3.informationage:

Whenwesaythatweliveintheinformationage,wemeanthatweliveinatimewheninformationisveryimportantandeasytoget.Theinformationageisaneraoffundamentalandglobalchangeinintellectual,philosophical,culturalandsocialterms.Today'

sinformationagebeganwiththetelegraph.Itwasthefirstinstrumenttotransforminformationintoelectricalformandtransmititreliablyoverlongdistances.Newtechniquesofencodinganddistributingdigitalinformationarepacingthespreadoftheinformationagethroughoutsociety.Forahistoricalperspectiveontheinformationtechnology,checkoutthewebsitesathttp:

//www.si.edu/resource/faq/nmah/techhistory.htmandhttp:

//photo2.si.edu/infoage/infoage.html.Thewebpageathttp:

//www.libraries.psu.edu/crsweb/infolit/andyou/mod9/infotech.htmprovidesextensivelinkstoissuesrelatedtotheinformationage.ForadiscussionofChinaintheinformationage,checkoutthepaperathttp:

//www.sims.berkeley.edu/~pam/papers/chinaip.html.

4.informationsuperhighway:

Anamefirstusedby（former）U.S.VicePresidentAlGoreforthevisionofaglobal,high-speedcommunicationsnetworkthatwillcarryvoice,data,video,andotherformsofinformationallovertheworld,andthatwillmakeitpossibleforpeopletosendemail,getup-to-the-minutenews,andaccessbusiness,governmentandeducationalinformation.TheInternetisalreadyprovidingmanyofthesefeatures,viatelephonenetworks,cableTVservices,onlineserviceproviders,andsatellites.IntheU.S.,theinformationsuperhighwayisalsoknownasNationalInformationInfrastructure（http:

//glossary.its.bldrdoc.gov/fs-1037/dir-024/_3476.htm）.Theinformationsuperhighwaycanbeunderstoodtobeahighwaywhichhascomputertechnologyandmoderncommunicationtechnologyservingasthebaseoftheroadandfiber-opticcablesservingasthesurfaceoftheroad.The“vehicles”arethemultimediamachinesequippedwithcomputer,televisionandtelephone,andhighspeedtransmissionandexchangeofvariousmultimediainformationformsthewebcoveringthewholenation.Ifthenationalsuperhighwaysallovertheworldarelinkedtogether,theglobalinformationsuperhighwaywillbecreated.

Whofirstcreatedtheideaof“constructing”asuperhighway?

In1955,AlbertGore,thenTennesseeDemocraticsenator,putforwardintheU.S.Congresstheactofinterstatesuperhighway,whichwaslaterprovedtohavegreatlypromotedtheAmericaneconomicdevelopment.In1991,hisson,AlGore,proposedanotheract—highperformancecomputingact,HPCA（http:

//www.hpcc.gov/congressional/laws/pl_102-194.html）.Forthefirsttime,HPCAdemandedhighperformancecomputerandcommunication.Thecoreoftheactistosetupanationalresearchandeducationnetwork,NREN.

Formoreinformationonthesubject,checkoutthewebsitesathttp:

//trochim.human.cornell.edu/gallery/abrahams/ish.htm,http:

//admin.engr.wisc.edu/IT/infohghy.cfmand.au/http/sfist/shwy0.htm.

5.BellSouthCorporation:

BellSouthisatelecommunicationscompanyintheU.S.thatmainlyservesthesouthernstates.Itsbusinessrangesfromvoice（suchaslocalandlong-distancetelephoneandwireless）todata（computernetworks）services.Formoreinformationaboutthecompany,checkoutitswebsiteat.

TheTelecommunicationsRevolution课文生词讲解（newwordsstudy）

NewWords

telecommunications 

n.[U]thesendingandreceivingofmessagesoverdistance,esp.bytelephone,radioandtelevision

电信，远距离通信

atelecommunicationssatellite

长途通信卫星

thetelecommunicationsindustry

电信业

Thecompanyspecializesintelecommunications.

这家公司专门从事长途通信。

dumb 

a.lackingthepowerofspeaking;

unabletospeak

哑的，不会说话的

Hewasstruckdumbwithfear.

他吓得说不出话来。

Theprisonerremaineddumbthroughouthistrial.

整个审判期间犯人一言不发。

utility 

n.1.[C]aserviceusedbythepublic,suchasanelectricityorgassupplyoratrainservice

公用事业，公用事业设施

apublicutility

公用事业公司

highutilitybill

高额公用事业开支

2.[U]theusefulnessofsth.,esp.inapracticalway

功用，效用，利用

Somekitchentoolshaveverylittleutility.

有些厨房用具几乎没有什么用处。

Theutilityofthisrescueequipmenthasstilltobeassessedinarealemergency.

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.oforusinglight,esp.forthepurposeofrecordingandstoringinformationforuseinacomputersystem

光学的，光的

anopticalfiber

光学纤维

Telescopesandmicroscopesareopticalinstruments.

望远镜和显微镜都是光学仪器。

2.oforaboutthesenseofsight;

visual

视力的，视觉的，眼睛的

anopticaleffect

视觉效果

Hesuffersfromanopticaldefect.

他有视觉障碍。

diameter 

n.[C]the（lengthofa）straightlinethatgoesfromonesideofaroundobjecttoanother,throughthecenteroftheobject

直径

Thediametermeasurestwicetheradius.

直径为半径的两倍。

Thepondissixfeetindiameter.

该池塘直径为6英尺。

millimeter 

n.[C]aunitoflengthwhichisequalto0.001meter

毫米

Amillimeterisone-thousandthofameter.

一毫米是一米的千分之一。

cable 

n.[C]（alengthof）wire,esp.twistedintothickstrongropeorusedtocarryelectricity

缆索，电缆

Therewerecablesusedfortelephones,lightsandcomputersalloverthefloor.

地上满是电话、电灯、计算机的线缆。

Theroadhasbeendugupinordertolaycables.

路被挖开以便铺设电缆。

copper 

n.[U]asoftreddishmetalthatisasimplesubstancethatiseasilyshapedandallowsheatandelectricitytopassthroughiteasily

紫铜，紫铜色

abraceletmadeofcopper

铜制手镯

a.madeofcopper,reddish-browncolor

铜的，铜色的

copperwire/pipes

铜线/铜管

Herhairshonecopperinthesunlight.

她的头发在阳光下闪着紫铜色。

parade 

n.1.[C]aseriesofpeopleorthingsthatseemsnevertoend

一连串，一批

anendlessparadeofadvertisements

一连串没完没了的广告

WhenIaskedhimabouthischildhood,herememberedaparadeofbaby-sitters.

当我问起他的童年时，他记起了一大批保姆。

2.[C]alineofpeople,vehicles,etc.movingforwardinorder,oftenasacelebrationofsomeevent

（庆祝）游行，检阅

Thesmallboyloveswatchingthesoldiersonparade.

这个小男孩喜欢看士兵的检阅队伍。

Thecrowdmarchedthroughtowninavictoryparade.

人群游行走过市中心，欢庆胜利。

spider 

n.[C]asmallinsect-likecreaturewitheightthinlegs

蜘蛛

aspider'

sweb

蜘蛛网

Spidersproducefinethreadswhichtheymakeintowebsinordertotrapinsectsforfood.

蜘蛛用