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1、Unit 9,Text,Sources of Electricity and Electric Circuit,New Words and Phrases,obtain btein vt. 获得 convenient knvi:njnt a. 方便的 device divais n. 装置 voltaic vlteiik a. 电流的，伏特的 mixture mikst n. 混合物 positive pztiv pul n. 正极 zinc zik n. 锌 negative negtiv a. 负的 portable p:tbl a. 轻便的 permanent p:mnnt a. 永久的
2、,recharge ri:t:d vt. 再充电 furnish f:ni vt. 供给 main mein n. 管道 load lud n. 负载 bulb blb n. 电灯泡 distribute distribju:t vt. 分配，分布 storage battery 蓄电池 run down 因消耗而衰减 conducting wire 导线 to some extent 在某种程度内,series circuit 串联电路 burn out 烧坏 series-connected 串联的 go out 熄灭 use up 用完 parallel circuit 并联电路,Exe
3、rcises,I. Translate the following words and expressions into English. 1.正极 2.负极 3.负载 4.电池 5.发电机 6.电流 7.电压 8.电阻 9.串联 10.并联,II. Compose the sentences with the following words and expressions according to the text. 1. the damp mixture/is sealed/the top of the cell/form drying out/prevent 2. is always p
4、resent/all conductors/the flow of electrons/resistance/to some extent/oppose/in every circuit/because 3. except for/the more resistance/the warmer/carbon/other semiconductor materials/and 4. the resistance of the wires/in circuits/the total resistance/is not important/where short connecting wires/in
5、 finding/are used 5. the total voltage/is present/all branches/applied to/of the circuit/across/a parallel circuit,III. Translate the following sentences into English. 1. 有两种装置可以获得电，一种是电池，一种是发电机。 2. 干电池可以方便地获得电，成本低，但它们的寿命较充电电池短。 3. 发电机可以将机械能转化成电能。 4. 一个电路至少有三个电量，它们是电压、电流和电阻。 5. 导线越长、横截面接越小，导线的电阻越大。
6、6. 电池串联可以获得大电压，电池并联的使用寿命比单个电池的长。,IV. Choose the best answer for each of the following. 1. Many years ago, John_ in London with his father for a long period of time. A. had been living B. had lived C. lived D. has been living 2. It_ two weeks since she_ down the stairs, but you can still see the brui
7、ses. A. was/fell B. is/has fallen C. will be/fell D. is/fell 3. I am sorry I_ to you for such a ling time. A. didnt write B. havent written C. wrote D. hadnt written,4. You wont know if it fits you until you_ it on. A. will try B. are trying C. try D. have tried 5. I would very much like to have gon
8、e to the party last night but I_. A. am not invited B. should not be invited C. was not being invited D. had not been invited 6. Since road is wet this morning, _ last night. A. it must rain B. it must be raining C. it must have rained D. it must have been rain 7. I want to go to the dentist, but yo
9、u _ with me. need not to go B. do not need go C. need not go D. need go out,8. The meeting was put off because we _ a meeting without John. A. are objected to have B. were objected to having C. objected to having D. objected to have 9. I cant remember where I _ my glasses. A. leave B. left C. had le
10、ft D. have left 10. You _ watch TV now, you_ prepare for the exam! A. oughtnt to ought to B. shouldnt should C. oughtnt to should D. shouldnt ought to,Translating Skills,科技英语翻译方法与技巧长难句的翻译 一、次序的处理 1采用顺译法 If, when an SCR is biased in the forward direction an current pulse is injected into the P region
11、 of junction 2 by momentarily applying voltage to the gate, junction2 becomes forward-biased and conduction through the SCR begins. 当晶闸管正向偏置时，如果对控制极加了瞬时正电压，从而由一个脉冲流进入结2的P区，这时结2正向偏置，晶闸管开始导通。,However, fiber systems can carry so many more telephone conversations at the same time than wire pairs, and ca
12、n carry them so much farther without amplification of regeneration, that when there are many telephone calls to be carried between points such as switching offices fiber systems arc economically attractive. 然而，光纤系统同时可容纳比线对多得多的电话线路，并且在不需要放大的情况下把信号送得更远。当俩点之间，比如中继局有很多电话呼叫要传诵的时候，光纤系统就是非常经济的。,2. 采用倒译法 A
13、student of mathematics must become familiar with all the signs and symbols commonly used in mathematics and gear them in mind firmly, and be well versed in the definitions, formulas as well as the technical terms in the field of mathematics, in order that he may be able to build up the foundation of
14、 the mathematical subject and master it well for pursuing advanced study. 为了打好数学基础，掌握好数学，以便学好深造，一个学数学的人必须和牢记数学中长远的符号，通晓定义、公式以及术语。,This is why the hot water system in a furnace will operate without the use of a water pump, if the pipes are arranged so that the hottest water rises while the coldest wa
15、ter runs down again to the furnace. 如果把管子装成能让最热的水上升，最冷的水流下回到锅炉去。那么锅炉中热水系统不用水泵就能运转，其道理就在于此。,二、结构的处理 翻译采用短句 The laser , its creation being thought to be one of todays wonders ,is nothing more than a light that differs form ordinary lights only in that it is many ,many times more intense and so can be applied , in the field that no ordinary light has ever been able to penetrate into 。 激光的发明虽然被认为是当代的一个奇迹，其实它也就是一种光。这种光不同于普通的光是因为它比普通的光强烈许多倍，因而能够应用于普通光无法穿透的地方。,2. 压缩句子，用词或短语代替 With radar ,we can “see” thing at a great distance and it shows us how far away they are ,in which direction they lie ,
