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1、1.把激光射束射向地球 Laser beams are emitted at the moon 2.这个模型描述了原子的情况 This model is descriptive of the behavior of an atom3.那位教授将做有关移动通讯方面的讲座 That professor will deliver a lecture on mobile communication 4.她给本科生上 C+程序设计语言课 She gives undergraduates lessons in the C+programming language5.这些学生在做物理实验 These stu
2、dents are making an experiment in physics6.他们在做电学实验 They are doing an experiment on electricity7.该教授对沃氏函数的研究起了重要作用 The professor has played an important role in the research on the Walsh Functions8.无线电波朝四面八方传播 Radio waves travel in all directions9.为此，我们必须在负载两端接一个电容器 For this purpose,we must connect
3、a capacitor across the load10.在这个温度上该金属就会融化 At this temperature the metai will melt11.该专家将在会议上宣读一篇重要的学术论文 The expert will read an important academic paper at the conference12.速度等于距离与时间之比 Speed is the ratio of distance to time13.太阳离地球的距离是很远的 The distance of the sun from the earth is very great14.温度对金
4、属导电率的影响是很小的 The effect of temperature on conductivity of metals is small15.本节论述晶体管与电子管相比的优点 This section deals with the advantages of transistors over electron tubes16.重力加速度随纬度的变化，部分原因是由于地球的自转 The variation of g with latitude is due in part to the earths rotation17.Y 对 x 的依从关系用 y=f(x)表示 The dependen
5、ce of y on x is expressed by y=f(x)18.人们用椭圆来描述行星绕太阳的运行情况 Ellipses are used to describe the motions of the planets around the sun19.我们讨论了电流通过酸碱盐溶液的情况 We have discussed the passage of an electric current through liquid solutions of acids,bases,and salts20.物体对净力 F 的影响就是正比于 F 的加速度 a The response of a bo
6、dy to a net force F is an acceleration a proportional to F21.把式（4）与式（6）相比较，我们就能的得到一下几个关系式 A comparison of Eq.(4)with Eq.(6)Leads to the following relations22.我们可以把一个力分解成 x 和 y 分量 The resolution force into x and y components is possible23.应避免使人体接触有潜在毒性的物质 Exposure of the body to potentially toxic sub
7、stances should be avoided24.这些特殊问题是有把原子能用作为能源而产生的 These special problems arise from the use of atomic energy as a source of power25.把电流定义为电荷的运动对我们大家都是熟悉的 The definition of an electric current as the flow of electric charge is familiar to all of us26.哥伦布发现美洲是在哪一天 What is the date of the discovery of
8、America by Columbus27.爱因斯坦确立了相对论是 20 世纪最重要的事件之一 The formation of the theory of relativity by Einstein is one of the most significant events of the 20th century28.门捷列夫于 1869 年发现了周期表使人们有了计算原子质量的另一种方法 The discovery of the periodic table by Mendeleev in 1869 suggested another way of estimating atomic ma
9、sses 29.这个工厂和那个一样大 The factory is as large as that one 30.铜的导电能力几乎和银一样好 Copper conducts electricity almost as well as silver31.这台计算机的体积是一台打印机的 3 倍 The size of this computer is there times as large as that of a typewriter32.那根导线长达 100 米 That wire is as long as 100meters33.这根导线不如那根长 This wire is not a
10、s long as that one(is)34.这台计算机的性能不如那台好 This computer dose not work so well as that one35.导线越长，电阻越大 The longer the wire ,the greater the resistance36.电压越大，电流就越大 The greater the voltage,the larger the current37.电流越大，在导线中产生的热量就越多 The larger the current,the more heat will be produced in the wire38.你学习越努
11、力，你的进步就会越大 The harder you study ,the greater progress you will make39.在无线电接收机中，一部分功率转变成了声波 In a radio receiver,some power is converted to song waves 40.绝缘体可以被用在导体之间来防止电流在他们之间流动 Insulators may be used between conductors in order to prevent the flow of electric current between them41.把理论应用于实践是非常重要的 To
12、 apply theory to practice is very important42.制作这样的电感器需要许多这样的线匝和铁芯 To construct such inductors requires many turns of wire and iron cores43.现在能够把太阳光直接转变成电 It is now possible to convert sunlight directly into electricity44.我们似乎能求出这个电流 It seems possible to find out this current45.操作这台机器并不是件容易的事 It is
13、not an easy job to operate this machine46.做实验是极为重要的 It is of great importance to make experiments47.解这个方程将要花费我们许多时间 It will take us a lot of time to solve this equation48.我们发现用弧度而不是用度数表示角度是比较方便的 It is found convenient to express angles in radians rather than in degrees49.当电流流过电路时，要损耗掉一部分能量 Flowing t
14、hrough a circuit,the current will lose part of its energy 50.若已知电流和电阻，我们就能求出电压 Given current and resistance,we can find out voltage51.由于铜具有大量的自由电子，所以它是良导体 Having a large number of free electrons,copper is a good conductor52.若用公式表示的话，电路中的电压，电流，电阻之间的关系可写成 V=IR Expressed in a formula,the relationship b
15、etween voltage,current and resistance in a circuit can be written as V=IR53.由于铜是电的良导体，所以被广泛的用在电工技术中 Being a good conductor of electricity,copper is widely used in electrical engineering54.银是最好的导体，其次是铜 Silver is the best conductor,followed by copper55. 是希腊字母“西格玛” ，它的意思是“.之和” is the Greek letter sigma
16、,meaning“the sum of”56.当机车拉着火车跑时，它就会做功 A locomotive does work while pulling a moving train57.将物体置于水中，就会感觉到他比较轻 When placed in water,everything will be found lighter58.这一设备，如果设计得当就可以用无线电控制 This device,properly designed,can be controlled by radio59.当把雷达信号发向月球时，由于月球是固体，所以能反射信号 When radar signals are sent to the moon,the moon,being solid,reflects them60.若该电流发生变化，磁
