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1、Unit17CellularMobileTelephoneSystem蜂窝移动电话系统PartThreeCommunicationandInformationProcessingTechnicalterms:1.cellularmobiletelephone蜂窝移动电话2.mobileserviceswitchingcenter(MSC)移动业务交换中心3.basestation(BS)基站4.mobilestation(MS)移动台5.publicswitchingtelephonenetwork(PTSN)公共电话交换网Preparingforthet
2、ext:Questionsfortextdiscussion:1.Telltheadvantagesformobilephoneoverfixedphone?------Themobilephoneisatransportable,carmountedorpockettelephone,itisveryconvenientforpeopletouseeverywhere.2.Whatarethethreebasicpartsforacellularmobiletelephonesystem?------Anautomaticcellularmobilete
3、lephonesystem(CMTS)consistsofthreemaincomponents:mobileservicesswitchingcenter(MSC),radiobasestation(BS)andmobilestation(MS)3.Whatarethefunctionsofbasestations?------EachbasestationisconnectedtoMSCbydigitaloranalogueconnectionsforspeechanddatacommunication.Themainideaofthisunit:Th
4、isunitmainlydiscussesthedevelopmentofthecellularmobiletelephonesystem.(1)Therearethreepartsforacellularmobiletelephonesystem.(2)Introducethefunctionofthethreeparts---MSC,BS,MS1.percentage(1)百分数[率,比](2)比例,部分(3)【商】手续费,佣金,折扣(4)利益,获利,好处,用处(5)(根据统计得出的)可能性apercentageof5百分之五nopercentage没
5、利益percentageofhits【军】命中率Whatpercentageofthestudentswereabsent?旷课的学生占百分之几?Alargepercentageofschool-booksnowhavepictures.现在大部分教科书有插图。NewWords2.telephony电话学,电话,电话制造telecom电信telecommunication电信3.subscription(1)签署;赞助(2)签名;有签名的文件(3)预订,订阅;预定费;订阅费(4)认捐(额);认缴(额)invitesubscriptionforaloan申请
6、批准放款open[close]thesubscriptionlists开始[截止]募捐[预订]renewone'ssubscriptiontoChinaDaily续订《中国日报》4.Spectacular引人入胜的,壮观的aspectacularachievementinscience科学上的一项惊人成就aspectaculardisplayoffireworks放焰火的壮观景象inaspectacularfashion惊人地,壮观地5.subscriber(1)捐助[款]人(2)预约者,订购者;订户(3)[thesubscriber]签名人(4)用户at
7、elephonesubscriber电话用户6.Universal(1)宇宙的;万物的(2)多方面的;多才多艺的;万能的;通用的universalrules一般的原则Hisspeechmetwithuniversalapplause.他的讲话得到全场的热烈掌声。Hewasauniversalgenius.他是一个多才多艺的天才。7.Coverage范围［美］保险总额；保证金TVcoverageoftheelectioncampaign竞选活动的电视报道Thecoverageofthesubjectinhisbotanytextisinadequate.他的
8、植物学教科书中对那题目的叙述不充分。8.geographical地
