计算机专业英语教程 教学课件 作者桑莉君 unit07.ppt

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1、UNIT7NetworkEssentials计算机专业英语COMPETENCIESAfteryouhavereadthisunit,youshouldbeableto:Discussnetworkandcommunication.Describelocalarea,metropolitanarea,andwideareanetwork.NameLANdevicesandWANdevices.Describecommonmedia.DescribethesevenlayersoftheOSIreferenc

2、emodel.DiscussthemainfunctionofeachlayeroftheOSIreferencemodel.TextANetworkOverviewConceptCheckWhatisanetwork?Whatisanetworktopology?Listfourprincipalnetworktopologies.Namethedifferenttypesofnetworkingmedia.ListdevicesforLANandforWAN.NewWordsandPhrasesins

3、tallationn.安装convergev.(指物体等)会于一点，向一点会合；聚集spectacularadj.引人注目的；出色的；与众不同的profoundadj.深的；深切的；深远的；极度的；极大的computationaladj.usingcomputers使用计算机的interconnectedadj.(彼此)有联系的；相互依存的intricateadj.复杂的cardiovascularadj.心血管的：心血管的，与心血管有关的，侵袭心血管的NewWordsandPhrasesapproach

4、n.方法；手段geographicadj.地理的metropolitanadj.大城市的reliableadj.可信赖的；可靠的infraredadj.红外线的ultravioletadj.紫外线的hierarchicaladj.分层的、分级的、层次的electromagneticadj.电磁的NewWordsandPhrasesfilterv.过滤backbonen.主干网络；主干线路dueto因为，由于，归于referto….as…..称……为……dependonsth.视某事物而定；取决于某事物No

5、tes1.Duetorapidtechnologicalprogress,theseareasarerapidlyconverging,andthedifferencesbetweencollecting,transporting,storing,andprocessinginformationarequicklydisappearing.[分析]其中后半句中主语、谓语分别是thedifferencesarequicklydisappearing，而介词短语“betweencollecting,trans

6、porting,storing,andprocessinginformation”是主语“thedifferences”的定语。Notes2.Theideathatwithin20yearsequallypowerfulcomputerssmallerthanpostagestampscouldbemassproducedbythemillionshasbecomereality.[分析]句中去除修饰成分，句子的主干是Theideahasbecomereality，而“idea”之后的that从句是修饰i

7、dea的同位语从句。Notes3.Theoldmodelofasinglecomputerservingalloftheorganization’scomputationalneedshasbeenreplacedbyoneinwhichalargenumberofseparatebutinterconnectedcomputersdothejob.[分析]全句的主要成分是Theoldmodelhasbeenreplacedbyone。句中“ofasinglecomputerservingallofthe

8、organization’scomputationalneeds”是oldmodel的后置定语；“inwhichalargenumberofseparatebutinterconnectedcomputersdothejob”是修饰“one”的。[译文]单个计算机服务于组织中的所有计算需要的旧模式已经被另一种模式取代，在这种模式中许多独立但互连的计算机完成这个工作。Notes4.Itincludesthesourceinfor