《电子信息工程专业英语导论》课件PART 1 unit4.ppt
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1、电子信息工程专业英语导论课件PART 1 unit4 Four short words sum up what has lifted most successful Four short words sum up what has lifted most successful individuals above the crowd: a little bit more. individuals above the crowd: a little bit more. -author -author -date-date New words and Technical Terms amplify
2、emitter transistor microprocessor silicon Prone to Vacuum tubes Text A transistor is a device that is composed of semiconductor material 1. 1.晶体管是一种由半导体材料组成的器件。晶体管是一种由半导体材料组成的器件。 本句是一个系表结构的句子,包含有定语从句。本句是一个系表结构的句子,包含有定语从句。 that is composed of semiconductor material用来修饰先行词用来修饰先行词device,that在从句中充当主语。在从
3、句中充当主语。 And it can amplify a signal or opens or closes a circuit, was invented in 1947 at Bell Labs. There are two types of standard transistors, NPN and PNP, with different circuit symbols 2. 2.标准的晶体管有两种类型:标准的晶体管有两种类型:NPN和和PNP,它们的电路标志不一样。它们的电路标志不一样。 with different circuit symbols是介词短语作是介词短语作非限定性的定语
4、,故后置且用逗号与中心词分非限定性的定语,故后置且用逗号与中心词分开。开。 The letters refer to the layers of semiconductor material used to make the transistor. Most transistors used today are NPN because this is the easiest type to make from silicon. If you are new to electronics it is best to start by learning how to use NPN transis
5、tors 3. 3.如果你是电子学的初学者,最好现在就开如果你是电子学的初学者,最好现在就开始学习如何使用始学习如何使用NPN型晶体管。型晶体管。 If you are new to electronics是一个条件是一个条件状语从句,在这个从句中,要用一般现在时状语从句,在这个从句中,要用一般现在时表示将来时。表示将来时。 it is best to意为意为you had better to,最好,最好做做。 Fig. 1-7. NPN and PNP transistor Look at Fig. 1-7,the leads are labelled base (B), collector
6、 (C) and emitter (E). Transistors have three leads which must be connected the correct way round 4: 4: 晶体管的三级都必须在电路中正确连接。晶体管的三级都必须在电路中正确连接。 这里这里which must be connected the correct way round是一个定语从句,修饰是一个定语从句,修饰three leads,which在从句里作主语,从句里是一个在从句里作主语,从句里是一个被动语态。被动语态。 the common-base, the common-emitter
7、 and the common-collector. Please take care with this because a wrongly connected transistor may be damaged instantly when you switch on. Transistors amplify current, for example they can be used to amplify the small output current from a logic chip so that it can operate a lamp, other high current
8、device. In many circuits a resistor is used to convert the changing current to a changing voltage, so the transistor is being used to amplify voltage. Today, transistors have become the key ingredient of all digital circuits, including computers. And, microprocessor contains tens of millions of micr
9、oscopic transistors. Prior to the invention of transistors, digital circuits were composed of vacuum tubes, which had many disadvantages5. 在晶体管发明之前,数字电路是由真空管组成的,这在晶体管发明之前,数字电路是由真空管组成的,这有很多不足。有很多不足。 Prior to在在以前,它后面一般接一个名词性的短语,以前,它后面一般接一个名词性的短语,digital circuits were composed of vacuum tubes, which ha
10、d many disadvantages 这一部分中用到了这一部分中用到了be composed of 句型,意为由句型,意为由组成,而组成,而which had many disadvantages是一个非限制性的定语从句,用是一个非限制性的定语从句,用来修饰先行词来修饰先行词vacuum tubes. They were much larger, required more energy, dissipated more heat, and were more prone to failures. Its safe to say that without the invention of
11、transistors, computing as we know it today would not be possible 6. 6.可以这么说,没有晶体管的发明,今天我们可以这么说,没有晶体管的发明,今天我们所知的计算是完全不可能的。所知的计算是完全不可能的。 Its safe to say that包含一个主语从句,意为包含一个主语从句,意为“可以这么说可以这么说”,其中,其中it是形式主语,真正的主是形式主语,真正的主语是后面的从句语是后面的从句that without the invention of transistors, computing as we know it to
12、day would not be possible; without the invention of transistors是是tha从句中的条从句中的条 件状语,后面的件状语,后面的 computing是动名词作主语。是动名词作主语。 Exercises: , , 专业英语翻译的标准专业英语翻译的标准 翻译是一种语言表达法,是译者根据原作翻译是一种语言表达法,是译者根据原作者的思想,用本国语言表达出来。者的思想,用本国语言表达出来。 专业英语与非专业英语文体相比,具有词专业英语与非专业英语文体相比,具有词义多、长句多、被动句多、词性转换多、非谓义多、长句多、被动句多、词性转换多、非谓语动词
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