页数：78页文件大小：758.1 KB来源： 电子信息与通信工程专业英语ppt课件
本课件先给出基本通信系统的组成，逐一说明信源、调制器、载波源、信道耦合器、信息信道、检测器、信号处理器与信宿八个环节在光纤通信中的实现方式；随后从损耗、传输容量、抗电磁干扰、绝缘与安全等方面说明光纤相对金属电缆的优点，并指出其技术与经济制约。
光纤通信：章节封面，标示本章主题与内容范围。
本页为英文原文段落，中文译文见本章「参考译文」部分。
本页英文原文由图片提取，部分单词之间空格缺失，已按大小写与标点边界补回分隔，确切分词请以课件原图为准。
本页为英文原文段落，中文译文见本章「参考译文」部分。
本页英文原文由图片提取，部分单词之间空格缺失，已按大小写与标点边界补回分隔，确切分词请以课件原图为准。
图10.1 genera lized
本页为图示页，图中给出10.1 基本通信系统的结构或流程，具体图形见课件原图。
本页为英文原文段落，中文译文见本章「参考译文」部分。
本页英文原文由图片提取，部分单词之间空格缺失，已按大小写与标点边界补回分隔，确切分词请以课件原图为准。
本页为英文原文段落，中文译文见本章「参考译文」部分。
本页英文原文由图片提取，部分单词之间空格缺失，已按大小写与标点边界补回分隔，确切分词请以课件原图为准。
Digital modulation involves transmit ting information indiscrete form. The signal iseitheronoroff. The on state represent sa digital 1, the off sta tea digital 0. These states are the binary dig its(orbits) of the digital system. The data rate is then umber ofbitsper second(b/s) transmitted. The sequence ofonandoffpulses might beacodedversiono fan analog message. An analog-to-digital converter develop sthe digital sequence from the analog message. There verse process occur sat the receiver, where the digital signal isreturnedtoits analog form. To impress adigitalsignalontoa carrier, the modulator need onlyturnthe source onoroffatthe appropriate time. The ease of construct ing digital modulator smakesthis format very attractive for fiber syst ems
本页为英文原文段落，中文译文见本章「参考译文」部分。
本页英文原文由图片提取，部分单词之间空格缺失，已按大小写与标点边界补回分隔，确切分词请以课件原图为准。
本页为英文原文段落，中文译文见本章「参考译文」部分。
本页英文原文由图片提取，部分单词之间空格缺失，已按大小写与标点边界补回分隔，确切分词请以课件原图为准。
本页为英文原文段落，中文译文见本章「参考译文」部分。
本页英文原文由图片提取，部分单词之间空格缺失，已按大小写与标点边界补回分隔，确切分词请以课件原图为准。
It should be emphasize dthatthein formation being transmitted is con taine din the variation oft he optic power. This is called intensity modulation(IM). Although the signal current has both positive and negative parts, the output power of alight emitter is always positive. To achieve linearity, the actual modulation current in an analog system must beentirely positive. ADC bias current, addedtothe desired information signal, accomplish est his result. Similar ly, them odulating current fora digital system is always positive. Because ala ser diode doe snot turnon(thatis, it doe snot radiate) until some threshold current is app lied, the modulation current could includea DC offset equal to this threshold value 9. The presence ofa binary 1 drivesthe current beyond threshold andmakesthe diode emit light. Abinary 0 lea vest he current at threshold, where norad iationoccurs. An LED does nothavea threshold and turn son whenever positive current flow sthroughit
本页为英文原文段落，中文译文见本章「参考译文」部分。
本页英文原文由图片提取，部分单词之间空格缺失，已按大小写与标点边界补回分隔，确切分词请以课件原图为准。
Laser diode sand LED shave been construct edt hat radiate at frequencies where glass fib ers are efficient transmitter so flight—thatis, where fiber shave low attenuation. This is indeed fortunate, because suitable source sem it tin gat arbitrary frequencies are difficult to obtain. Without this match between source frequency and fiber low-loss region, fiber optical communication swouldnot exist
本页为英文原文段落，中文译文见本章「参考译文」部分。
本页英文原文由图片提取，部分单词之间空格缺失，已按大小写与标点边界补回分隔，确切分词请以课件原图为准。
本页为英文原文段落，中文译文见本章「参考译文」部分。
本页英文原文由图片提取，部分单词之间空格缺失，已按大小写与标点边界补回分隔，确切分词请以课件原图为准。
One difficulty arise sbecauseofthe small size of conventional fib ers, which have diameter soft he order of 50 millionth sofa meter. However, the large loss basically occur sbe cause light source sem ito vera large angular extent. Fib ers capture light onlywithinmoreli mite dang les. The light emitter is me rely butted against the fiber. Asindicated, even if the fib eris big enough to intercept all the light ray semi ttedbythe source, the light will notbeenti rely collected, because of the difference between the radiation and acceptance coneangles. More efficient, but also more complex, coupler scan beconstructed. The channel coupler is anim port ant part ofthedesignofa fiber system because of the possibility ofhighlosses
本页为英文原文段落，中文译文见本章「参考译文」部分。
本页英文原文由图片提取，部分单词之间空格缺失，已按大小写与标点边界补回分隔，确切分词请以课件原图为准。
本页为英文原文段落，中文译文见本章「参考译文」部分。
本页英文原文由图片提取，部分单词之间空格缺失，已按大小写与标点边界补回分隔，确切分词请以课件原图为准。
Optical amplifier sboostthe power level sofweaksignals. The yare needed inverylonglinks(hundred sand thousand sofkilometers) to provide sufficient power to the receiver. Repeat ers(also known asregenerators) convert 10 weak and distorted optical signal sto electric alone sand then reg ene rate the original digital pulse trainsfor further trans mission. Repeater scan beusedonlyfor digital syst ems;optical amplifier saresui table for both analog and digital sign als. Optical amplifier scompensateonly for signal attenuation, but repeater sre constitute both the amplitude and wave shape ofa digital signal. Ina long system, numerous amplifier sand some repeat ers maybe utilized. Being much more complex, repeat ers are more expensive thana mplifiers
本页为英文原文段落，中文译文见本章「参考译文」部分。
本页英文原文由图片提取，部分单词之间空格缺失，已按大小写与标点边界补回分隔，确切分词请以课件原图为准。
Another important property of the information channel is the propagation time oft hew ave str ave ling along it. Inge neral, the travel time depend son the light frequency an don the path taken bythelightrays. As ign alp ropagatingalonga fiber norm ally contain saran geo fop tic frequencies(because optic source semi tarangeof frequencies) and divide sitspower along several ray paths. This result sin adistortionofthe prop aga ting signal. Ina digital system, this distortion appear sas asp reading and deform ingoftheonpulses. The spread ing incr ease swiththe distance traveled. Eventual ly, the spread ing iss ogre att hat adjacent pulse sbeginto overlap and become unrecognizableas separate bit so fin formation. Error sin the trans mission now result. To keep this from occurring, pulse smustbe transmitted less frequent ly
本页为英文原文段落，中文译文见本章「参考译文」部分。
本页英文原文由图片提取，部分单词之间空格缺失，已按大小写与标点边界补回分隔，确切分词请以课件原图为准。
本页为英文原文段落，中文译文见本章「参考译文」部分。
本页英文原文由图片提取，部分单词之间空格缺失，已按大小写与标点边界补回分隔，确切分词请以课件原图为准。
In an atmospheric electronic communication ssy stem, an antenna collect sthesignal from the information channel and route sit tother est of the receiver. In the fiber system, the output coupler me rely direct sthelightemerg ing from the fiber onto the light detector. This light is radiate dina pattern identic alto the fiber'sacceptance cone. Because common photo detector shave large surface area sand large acceptance ang les, light can beef ficiently coup led from the fiber bya simple butt connection
本页为英文原文段落，中文译文见本章「参考译文」部分。
本页英文原文由图片提取，部分单词之间空格缺失，已按大小写与标点边界补回分隔，确切分词请以课件原图为准。
本页为英文原文段落，中文译文见本章「参考译文」部分。
本页英文原文由图片提取，部分单词之间空格缺失，已按大小写与标点边界补回分隔，确切分词请以课件原图为准。
本页为英文原文段落，中文译文见本章「参考译文」部分。
本页英文原文由图片提取，部分单词之间空格缺失，已按大小写与标点边界补回分隔，确切分词请以课件原图为准。
Fora digital system, the processor can include decision circuit sin addition to amplifier sand filters. The decision circuit dec ides whet hera binary 1 or 0 was received during the time slot of any individual bit. Because of una void able noise, there will always be some prob ability of err orin this process. Thebit-error rate(BER) should be very small for quality comm unications. The digital-signal processor must also dec ode the in coming sequence of 0 sand 1 sift he original message was analog. This isdonebya digital-to-analog converter, which recreate sthe original electrical form of the information. Ifthecommunications were between mach ines, then the digital form might be suitable for use without digital-to-analog con version
本页为英文原文段落，中文译文见本章「参考译文」部分。
本页英文原文由图片提取，部分单词之间空格缺失，已按大小写与标点边界补回分隔，确切分词请以课件原图为准。
本页为英文原文段落，中文译文见本章「参考译文」部分。
本页英文原文由图片提取，部分单词之间空格缺失，已按大小写与标点边界补回分隔，确切分词请以课件原图为准。
本页为英文原文段落，中文译文见本章「参考译文」部分。
本页英文原文由图片提取，部分单词之间空格缺失，已按大小写与标点边界补回分隔，确切分词请以课件原图为准。
本页为生词与短语（New words and phrases）列表，收录本节出现的专业词汇。
| 英文词条 | 音标 | 中文释义 |
|---|---|---|
| electrical | [iˈlektrikəl] | 与电有关的，电学的，电的 |
| microphone | [ˈmaikrəfəun] | 麦克风，话筒，传声器 |
| current | [ˈkʌrənt] | 现在的，现行的，通用的，通行的，被普遍接•电流 |
| portion | [ˈpɔ:ʃən] | 一部分，一份•把……分成份额，分配 |
| proper | [ˈprɔpə] | 适合的，适当的 |
| continuous | [kənˈtinjuəs] | 连续的，没有中断的 |
| appropriate | [əˈprəupriət] | 合适的，适合的，适宜的 |
| converter | [kənˈvə:tə] | 转换器，变频器，整流器，变流器 |
| occur | [əˈkə:] | 发生，举行，存在 |
| attractive | [əˈtræktiv] | 有吸引力的 |
词条按原文「中文释义—音标—英文词条」的顺序识别，如与原件排版不符以课件原图为准。
本页为生词与短语（New words and phrases）列表，收录本节出现的专业词汇。
| 英文词条 | 音标 | 中文释义 |
|---|---|---|
| oscillator | [ˈɔsileitə] | 振荡器 |
| sufficient | [səˈfiʃənt] | 足够的，充足的 |
| propagation | [prˈɔpəˈɡeiʃən] | 繁殖，增殖 |
| radiate | [ˈreidieit] | 发射出 |
| moderate | [ˈmɔdərit] | 中等的，适度的，不是很大的 |
| arbitrary | [ˈɑ:bitrəri] | 任意的，武断的，随心所欲的 |
| region | [ˈri:dʒən] | 地区，地带，区域，范围 |
| lens | [lenz] | 透镜，镜头，镜片 |
词条按原文「中文释义—音标—英文词条」的顺序识别，如与原件排版不符以课件原图为准。
本页为课文注释（Notes），讲解本节难句的句式与翻译处理。
本页英文原文由图片提取，部分单词之间空格缺失，已按大小写与标点边界补回分隔，确切分词请以课件原图为准。
本页英文原文由图片提取，部分单词之间空格缺失，已按大小写与标点边界补回分隔，确切分词请以课件原图为准。
本页英文原文由图片提取，部分单词之间空格缺失，已按大小写与标点边界补回分隔，确切分词请以课件原图为准。
本页为英文原文段落，中文译文见本章「参考译文」部分。
本页英文原文由图片提取，部分单词之间空格缺失，已按大小写与标点边界补回分隔，确切分词请以课件原图为准。
The basic material for glass fiber sis silicon dioxide, which is plentiful. Some optic fib ers are made of trans parent plastic, another readily available material. Costsare often the most important con side ratio nina system. Comparison sbe tween fiber and metallic cab les must bed one with care. There are many fiber cab les available, some of which are cheap ert han their wire equiv ale nts. The savings maybe come particular ly apparent when the comparison is mad eon the basis of cost peru nit of information transfer. For example, ava lid comparison fora telephone link would beonthebasisofcostper 3 meter per telephone channel, rather than just cost per meter. This consideration arise sbe cause fiber shave greater information-carry ing capacities than dome tall icchannels
本页为英文原文段落，中文译文见本章「参考译文」部分。
本页英文原文由图片提取，部分单词之间空格缺失，已按大小写与标点边界补回分隔，确切分词请以课件原图为准。
Economic com paris ons should also include thecostsof installation, operation, and maintenance. Some genera lit ies about these concern sareworth present ing. For long paths, fiber cable sarecheaperto transport andeasierto install than metal cab les. This is because fiber saresmalle rand lighter. One cable design hasa fiber 125µmin diameter enclose dina plastic sheath of 2.5 mminouter diameter. Thew eight of this cable is 6 kg/km;the los sis 5 d B/km. Let us compare this cable with the RG-19/Uco axial cable, which hasa nattenuationof 22.6 d B/kmwhencarryinga 100 MH zsignal. It souter diameter is 28.4 mm, anditsweightis 1110 kg/km. Small erand lighter coaxial cab les are available, but they have high erlosses than the RG-19/U. The significant size and weight advantage sof fiber cab lesa reap parent from this example
本页为英文原文段落，中文译文见本章「参考译文」部分。
本页英文原文由图片提取，部分单词之间空格缺失，已按大小写与标点边界补回分隔，确切分词请以课件原图为准。
There are no great difference sbe tween the operation of fiber system sand that of metallic syst ems. Thecosts here should bethe same. Maintenance of fiber cab les does differ, however. If aline is broken, asa result of either an accident ora system modification, splice smustbemadeornew connect ors attached. These operation sre quire more time and skill for fiber sthanforwires. Asa result, maintenance cost sshouldbe considered when designing asystemin which many change sarelikelytobe made
本页为英文原文段落，中文译文见本章「参考译文」部分。
本页英文原文由图片提取，部分单词之间空格缺失，已按大小写与标点边界补回分隔，确切分词请以课件原图为准。
Fiber sand fiber cable shave turned out tobesurprisingly strong and flexible. Some fib ers are sos lender that they do not break when wrapped around curve sofonlyafewcenti met ers radius. Fiber sareoftenstored and trans porte dwhiletightly wrapped around spool shaving this small curvature 4. Fiber flexibility is attractive for installation scontainingmanyturns along the trans mission path. Fora large-radius bend, fib ers guide light with negligible loss. There is some los sat avery tight bend, however. When afiberis protected—for example, byencasingi tina plastic sheath—it is difficult tob end theca bleintoa radius small enough to break the fiber. Fiber sem bedded inca blesdonot break easily
本页为英文原文段落，中文译文见本章「参考译文」部分。
本页英文原文由图片提取，部分单词之间空格缺失，已按大小写与标点边界补回分隔，确切分词请以课件原图为准。
The addition ofa plastic sheath incr easesthe tensile strength ofa fiber trans mission line. Steel rod scan be placed inside the plastic cab leto add further strength, if needed. Another strengthen ing material is Kevlar, asynthetic polymer fiber with great tensile strength. Despite the apparently fragile nature of glass, optic fiber cab les are very rugged and service able
本页为英文原文段落，中文译文见本章「参考译文」部分。
本页英文原文由图片提取，部分单词之间空格缺失，已按大小写与标点边界补回分隔，确切分词请以课件原图为准。
Technique shave been developed for the production of fib ers with very low trans mission los ses. Many fiber design sexist, but an attenuation of 4 d B/kmistypicalof commercial glass fib ers when operate data wavelength around 0.82µm. This represent satrans mission efficiency of 40%fora 1 km length. This degree of transparency could notbeachieved before 1970. Now, fib ers with loss esofonlyafew tenth so fad B/kmare available for use around 1.3µmand 1.55µm. Very long communication slink scan be construct edbecauseof thea vail ability of low-loss fib ers. Amplifiers, needed to amplify weak sign als, can be locate dat large intervals. Thelossesof wire trans mission line sin crease rapid lywith frequency. At high frequencies, link length sand amplifier spacing swouldbe significant lysmallerfor wire system sthanforfibersystems
本页为英文原文段落，中文译文见本章「参考译文」部分。
本页英文原文由图片提取，部分单词之间空格缺失，已按大小写与标点边界补回分隔，确切分词请以课件原图为准。
本页为英文原文段落，中文译文见本章「参考译文」部分。
本页英文原文由图片提取，部分单词之间空格缺失，已按大小写与标点边界补回分隔，确切分词请以课件原图为准。
Adramatic comparison can bema debetweena standard wire telephone cable andafiber cable. Theme talca blecontains 900 twisted-wirepairs, anditsdiamet eris 70 mm. Each pair carr ies 24 voice channels(T 1 rate), so the cable capacity is 21600 calls. One fiber cable developed for telephone application shasa 12.7 mmdiameterandconta ins 144 fibers, each opera tin gat the T 3 rate(672 channels). This cable hasa total capacity of 96768 calls. The fiber cable hasnearly 4.5 time sas much capacity as the wire cable and hasa cross-sectional area that is 30 timesless 5. Still more remark able comparison scan bema deifoperationata high err ate(say 2.5 Gbpsor 10 Gb/s) is assumed
本页为英文原文段落，中文译文见本章「参考译文」部分。
本页英文原文由图片提取，部分单词之间空格缺失，已按大小写与标点边界补回分隔，确切分词请以课件原图为准。
Optic fib ers, glass or plastic, areinsulators. No electric currents flow through them, either owingtothe transmitted signal orowingto external radiation striking the fiber. In addition, the optic wave within the fib eris trapped, sononeleaksout during trans mission to interfere with signal sin other fib ers. Converse ly, light cannot couple int othefiberfromits side. We conclude that afiberi swell protected from interference and coupling with other communication schannels, whether the yare electrical or optic
本页为英文原文段落，中文译文见本章「参考译文」部分。
本页英文原文由图片提取，部分单词之间空格缺失，已按大小写与标点边界补回分隔，确切分词请以课件原图为准。
Fort hose reason sno ted, fiber shave excellent rejection of radio-frequency interference(RFI) and of electro magnetic interference(EMI). RFI ref ers to interference caused by radio and television stations, radar, and other signal sori gina tin gin electronic equipment. EMI include sbothsuchsourcesof radiation and those caused by natural phenomena(such as lightning) orca use dun intention ally(such ass parking). Ifnotrejected, then these undesiredsignals could incr ease the system noise level beyond accept ablelimits. Afiberexce lsat reject ing extern ally caused background noise. The ability ofafiberto isolate itself from its environ mental lowsusto pack numerous fib ers together ina cab leto transmit many channel so fin formation along as ingle path. No crosstalk occurs
本页为英文原文段落，中文译文见本章「参考译文」部分。
本页英文原文由图片提取，部分单词之间空格缺失，已按大小写与标点边界补回分隔，确切分词请以课件原图为准。
Because fiber sareinsulators, they will not pickup or propagate electro magnetic pul ses(EMP) caused by nuclear explosions, which can induce million sofvoltsinacon duct ing trans mission line. The voltage pulse cant ravel many miles along thew ireandeventu ally(because ofits strength) destroy the electronic sat the end of the path
本页为英文原文段落，中文译文见本章「参考译文」部分。
本页英文原文由图片提取，部分单词之间空格缺失，已按大小写与标点边界补回分隔，确切分词请以课件原图为准。
The insula ting nature ofafiberhas several other practical cons equences. Inane nvironmentin which high-volta gel ines are present, awirecommuni cation slink could possibly short-circuit thelinesbyfal ling across them, caus ing consider able damage. Spar king occurring in this process could ignite combustible gasesinthe area. This problem dis appear swithfibers. Another adv anta geist hat optic coupling eliminate stheneed fora common ground between afiber transmitter and receiver. Trouble some ground loop sarenot formed. Addition ally, it is possible tore pair the fiber while the system is on without the possibility of short-circuit ing the electronic sat the transmitter or receiver. This problem might occur when repair in game tall icc able
本页为英文原文段落，中文译文见本章「参考译文」部分。
本页英文原文由图片提取，部分单词之间空格缺失，已按大小写与标点边界补回分隔，确切分词请以课件原图为准。
Fib ers off era degree of security and privacy. Because fib ers do not radiate the energy within them, itisdifficultf oran intruder to detect the signal being transmitted. The fiber would have to be physic ally viola ted to obtain the signal. Break ing the fiber, orfusing anew fiber to the transmit ting fiber, would provide access to the optic beam. During such modification oft hel ink, the power reach ing the receiver, would drop. Asensitive receiver can measure this loss, providing knowledge that an intrusion is occurring. To improve the success of detection, the system would have to be monitored continuous ly
本页为英文原文段落，中文译文见本章「参考译文」部分。
本页英文原文由图片提取，部分单词之间空格缺失，已按大小写与标点边界补回分隔，确切分词请以课件原图为准。
Electronic communication ssystems include process ing of information before it is delivered to the information channel and aft eritrea chest here ceiving terminal. Optic syst ems include process ing that is very similar. This similarity allow sin corp oration of fiber sin to system sori gin ally established for wire trans mission withonly moderate modifications. Fiber compatibility with the basic structure of the telephone system isa good example. Iti seven possible to make an optic system trans parent to the user. This mean stheuserneednotbe aware that the electrical signal has been converted to optic form, transmitted asa beam of light, and then returned toits electrical form. Us ers sim ply supply electrical in put sand receive electric aloutputs, just astheydofo rall-electronic syst ems. Compatibility with electronic system salsomeans that person strained in electronic communication scan transfer their skill stofibercommunications rather easily
本页为英文原文段落，中文译文见本章「参考译文」部分。
本页英文原文由图片提取，部分单词之间空格缺失，已按大小写与标点边界补回分隔，确切分词请以课件原图为准。
本页为英文原文段落，中文译文见本章「参考译文」部分。
本页英文原文由图片提取，部分单词之间空格缺失，已按大小写与标点边界补回分隔，确切分词请以课件原图为准。
本页为英文原文段落，中文译文见本章「参考译文」部分。
本页英文原文由图片提取，部分单词之间空格缺失，已按大小写与标点边界补回分隔，确切分词请以课件原图为准。
本页为生词与短语（New words and phrases）列表，收录本节出现的专业词汇。
| 英文词条 | 音标 | 中文释义 |
|---|---|---|
| angular | [ˈæŋgjʊlə] | 有角的，成角的 |
| compensate | [ˈkɔmpenseit] | &，补偿，弥补 |
| adjacent | [əˈdʒeisənt] | (地区，建筑，房间等)与……毗连的，邻近的 |
| velocity | [viˈlɔsiti] | 速度，高速，快速 |
| contradictory | [kɔntrəˈdiktəri:] | 矛盾的，抵触的 |
| radiated | [ˈreidieitid] | (装饰物等)有辐射棱线的,辐射的 |
| cathode | [ˈkæθəʊd] | 【电】(-)阴极,负极 |
| caution | [ˈkɔ:ʃən] | 小心，谨慎，慎重，(对危险或风险的)警告，告诫 |
| merit | [ˈmerit] | 功勋，功劳，价值，值得赞扬(或奖励，钦佩)的特点，功绩，长处 |
| versus | [ˈvə:səs] | (表示两队或双方对阵)对抗，(比较两种不同想法，选择等)与……相对，与……相比 |
| dioxide | [daiˈɔksaid] | 【化】二氧化物 |
词条按原文「中文释义—音标—英文词条」的顺序识别，如与原件排版不符以课件原图为准。
本页为生词与短语（New words and phrases）列表，收录本节出现的专业词汇。
| 英文词条 | 音标 | 中文释义 |
|---|---|---|
| metallic | [miˈtælik] | 金属的 |
| centimeter | [ˈsent imitər] | 厘米 |
| apparent | [əˈpærənt] | 显然的，明白的，清晰可见的，表面上的，貌似(真实)的 |
| splice | [splais] | 胶接处，粘接处，铰接处 |
| flexible | [ˈfleksəbl] | 易弯曲的，柔韧的，灵活的，可变通的 |
| slender | [ˈslendə] | 苗条的，修长的，细长的，薄的，微薄的 |
| wrapped | [ræpt] | 有包装的，预先包装的 |
| spool | [spu:l] | (绕线，铁线，照相软片等的)管，筒，线轴 |
| rugged | [ˈrʌgid] | 崎岖不平的，多岩石的，健壮，强健而富有魅力的，粗犷的，坚强的，坚毅的 |
词条按原文「中文释义—音标—英文词条」的顺序识别，如与原件排版不符以课件原图为准。
本页为生词与短语（New words and phrases）列表，收录本节出现的专业词汇。
| 英文词条 | 音标 | 中文释义 |
|---|---|---|
| megahertz | [ˈmeɡəˌhəːts] | 兆赫(，) |
| electromagnetic | [iˌlektrəʊmægˈnetik] | 【物】电磁的 |
| explosion | [iksˈpləuʒən] | 爆炸，爆发，激增，扩大，(感情，尤指愤怒的)突然爆发，迸发 |
| combustible | [kəmˈbʌstəbəl] | 易燃的，可燃的•易燃物，可燃物 |
| intruder | [inˈtru:də] | 未请自入者，闯入者(尤指企图行窃者) |
| compatibility | [kəmˌpætəˈbiləti] | 适合，一致，互换性，通用性，兼容性，和睦相处，并存，相容•，有胶囊包着的 |
词条按原文「中文释义—音标—英文词条」的顺序识别，如与原件排版不符以课件原图为准。
本页为课文注释（Notes），讲解本节难句的句式与翻译处理。
本页英文原文由图片提取，部分单词之间空格缺失，已按大小写与标点边界补回分隔，确切分词请以课件原图为准。
本页英文原文由图片提取，部分单词之间空格缺失，已按大小写与标点边界补回分隔，确切分词请以课件原图为准。
下载地址：{{downurl}}
{{{a}}}
{{#b}}{{{b}}}
{{/b}} {{/title}} {{#nolog}}登陆注册
{{/nolog}} {{#djsx}}点我刷新
{{/djsx}} {{#gocz}} {{/gocz}} {{#ffqr}} {{/ffqr}}