高中英语人教版高二下11

[04:16.81]电话设备取得了长远的进步
[04:19.40]in the last quarter of the twentieth century.
[04:21.76]20世纪最后的25年中,
[04:24.12]For example,
[04:27.05]radio waves can be used to send telephone signals over long distances,
[04:30.93]例如:无线电波可以用来传送长途电话信号了,
[04:34.81]often by satellite.
[04:36.58]经常通过卫星来传送的.
[04:38.36]The problem with electrical signals
[04:40.49]电信号有一个难题
[04:42.62]is that they get weaker and weaker as they travel along metal wires.
[04:46.00]就是当其沿着金属导线传送时,信号就会变得越来越弱.
[04:49.38]They need to be strengthened every3-4 km.
[04:52.57]因此,每隔3-4公里,信号就得增强.
[04:55.76]Light signals,however,
[04:57.59]然而光信号,
[04:59.42]can travel 150 km without getting weaker and their signal is clearer too.
[05:04.04]能传输150公里而不减弱而且光信号也比较清晰
[05:08.66]So nowadays,instead of using metal wires to send electrical signals,
[05:12.24]因此,当今不用金属导线来传送信号了,
[05:15.82]very thin glass pipes,about 1 mm wide,are used to send light signals.
[05:20.80]而用光纤管来传送光信号这种光纤管只有一毫米宽.
[05:25.77]A person's voice is changed into electrical signals.
[05:28.75]人的声音先变成电信号,
[05:31.73]These electrical signals are turned into light signals
[05:34.81]电信号再变成光信号,
[05:37.89]which are sent down the thin "pipe".
[05:39.93]沿着这种纤细的"管子"传送出去.
[05:41.97]At the other end,the light signals are received
[05:44.91]在另一端,收到光信号
[05:47.85]and changed back into electrical signals and finally sound.
[05:51.53]再变成电信号,最后变成声音.
[05:55.21]THE TELEPHONE IN THE OFFICE
[05:57.13]办公室用的电话
[05:59.05]New models of telephone are now produced especially for offices.
[06:02.38]现在生产出了特别给办公室用的新型电话.
[06:05.71]These are some of the ways in which they can be used.
[06:08.50]它们可以用于以下几种方式.
[06:11.28]1 Conference calling.
[06:15.85]It is possible to connect several telephone numbers together
[06:18.42]可以接通好几个电话号码
[06:21.00]so that you can all speak.
[06:22.92]以便大家都能讲话.
[06:24.84]Even though you may each be in different towns,
[06:30.09]you can still have your conference.
[06:32.31]即使在不同的城镇,你们仍然可以用电话来开会.
[06:34.53]2 Dialling.
[06:36.36]2.缩位拨号.
[06:38.18]With some models,
[06:39.86]在有些新型电话机上.
[06:41.53]you can record the telephone numbers of people who you call frequently.
[06:44.72]你能把经常与之通话的人的电话号码记录下来.
[06:47.90]So,instead of dialling 12 numbers in order to speak to someone,
[06:51.18]这样,你要给某人通话时就不要拨12个数字.
[06:54.46]you only have to dial a single number.
[06:56.78]而只要拨一个号码就行了.
[06:59.11]3 Redirection.
[07:01.24]3,转移呼叫.
[07:03.37]If you are out of the office,
[07:07.23]you can have all calls redirected to another number.
[07:10.05]如果你不在办公室,你可以把所有呼叫你的电话转到另一个号码去.
[07:12.88]This is useful,especially for doctors.
[07:14.85]这项功能很有用,特别对医生更有用.
[07:16.82]With some models,if you are speaking on the telephone,
[07:19.84]在有些型号的电话机上,假如你正在打电话,
[07:22.85]a signal shows you that somebody else is trying to call you.
[07:25.94]而另外又有人在呼你,这时就会有信号显示出来
[07:29.02]It also shows you the caller's telephone number
[07:31.59]而且它还可以把呼叫的人的电话号码显示出来.
[07:34.16]in order that you recognize who it is.
[07:36.54]以便你认出是谁在呼叫你.
[07:38.92]Lesson 91 1 Reading comprehension
[07:50.88]MOBILE PHONES
[07:52.41]移动式电话机
[07:53.94]A mobile phone has no wires and can be carried about in your pocket or your bag.
[07:57.57]移动式电话机没有导线,你可以放在口袋或提包里带着到处走.
[08:01.20]It is smart.
[08:02.64]这种电话很灵巧.
[08:04.08]If you need to ring someone,
[08:05.84]假如你要给某人打电话,
[08:07.60]you just press the numbers and the phone will connect you to the right number.
[08:10.88]你只需要按号码,电话就接通了.
[08:14.16]You can take it with you wherever you go,
[08:16.44]无论你走到哪里,你都可以带着它,
[08:18.73]for example,when you go for a meal in a restaurant.
[08:21.55]例如:去饭店吃饭,
[08:24.37]Someone can also ring you,