專業(yè)英語

——SpecializedEnglish

Unit16：第二部分通信技術(shù)FrameRelayandATM

NEWWORDSANDPHRASES

relentlessadj.無情的throughputn.生產(chǎn)量,生產(chǎn)能力,吞吐量substantialadj.堅(jiān)固的,實(shí)質(zhì)的,真實(shí)的,充實(shí)的overheadn.開銷，額外開銷；系統(tǒng)開銷infrastructuren.下部構(gòu)造,基礎(chǔ)下部組織intranetn.企業(yè)內(nèi)部互聯(lián)網(wǎng)paradigmn.范例supplementaladj.補(bǔ)足的,追加的standbyn.可以信任的人,使船待命的信息；備用NEWWORDSANDPHRASES

proliferationn.增殖,分芽繁殖degradev.(使)降級(jí),(使)墮落,(使)退化intermediateadj.中間的ATM(AsynchronousTransferMode)異步傳輸模式ISDN(IntegratedServicesDigitalNetwork)綜合業(yè)務(wù)數(shù)字網(wǎng)FrameRelay幀中繼Asthespeedandnumberoflocalareanetworks(LANs)continuetheirrelentlessgrowth,increasingdemandisplacedonwideareapacket-switchingnetworkstosupportthetremendousthroughput

generatedbytheseLANs.全句可譯為：“隨著局域網(wǎng)（LAN）的速度和數(shù)量的無情增長，對廣域分組交換網(wǎng)的要求也在提高，這些廣域網(wǎng)用來處理局域網(wǎng)產(chǎn)生的巨大的吞吐量。”

“tosupportthetremendousthroughputgeneratedbytheseLANs.”是不定式短語作目的狀語?！癵eneratedbytheseLANs.”是分詞短語作throughput的后置定語。TEXTFortunately,severalnewgenerationsofhigh-speedswitchedservicesforwideareanetworkinghavemovedrapidlyfromresearchlabandthedraftstandardstagetothecommerciallyavailable,standardized-productstage.全句可譯為：幸運(yùn)的是，一些新生代的廣域網(wǎng)高速交換業(yè)務(wù)（技術(shù)）已經(jīng)迅速從實(shí)驗(yàn)室草圖標(biāo)準(zhǔn)階段進(jìn)入到可商業(yè)化的、標(biāo)準(zhǔn)化產(chǎn)品階段。Althoughframerelayisaswitchednetworktechnology,theframerelayprotocolcanbeusedoveradedicatedlinetoprovideaconvenientandflexiblemultiplexingtechnique.全句可譯為：“盡管幀中繼是一種交換網(wǎng)技術(shù)，（但是）幀中繼（也）可作為一種在專用線路上便捷、靈活的復(fù)用技術(shù)。”

Otherissuesthatcomplicatetheselectionprocessincludethedifficultyofforecastingfuturetrafficvolumesbyorganizationswithwideareanetworkingrequirements,anddifficultyinforecastingtrafficdistributionsgiventheflexibilityofapplicationsandthemobilityofusers.全句可譯為：“使問題復(fù)雜化的其它問題包括：有組織的、隨著廣域網(wǎng)要求預(yù)測未來的通信量的困難以及假設(shè)性的、業(yè)務(wù)靈活性和用戶的移動(dòng)性預(yù)測通信量的分布?！盜nX.25,multiplevirtualcircuitsarecarriedonasinglephysicallink,andthelink-layerprotocolprovidesreliabletransmissionfromthesourcetothepacket-switchingnetworkandfromthepacket-switchingne