科技英语

1.用这种方法抽出两张连续的红桃的概率为1/17。

There is a 1-in-17 chance of drawing two successive hearts in this manner.

2.现在有色金属的种类几乎是原来的四倍。

The varieties of nonferrous metals are nearly four times what they were.

3.这个温度比先前提到的150摄氏度有了明显的下降。

This temperature is a marked decrease over the 150C previously cited.

4.动物不论大小都有种属之分。

There are races between animals large and small.

5.如果让阳光透过棱镜的话，阳光就会分解成彩虹般的各种绚丽的颜色。

Shine sunlight through a prism and it breaks into the glorious colors of the rainbow.

6.该网络的Q值改变到了原来的XXX倍。

The Q of the network is altered by a factor of XXX.

7.在这种情况下，该球会朝着与其原来的圆形道路正切的方向飞出去。

In this case the ball files off tangent to its original circular path.

8.虽然电视接收机遵循的基本模式与上面提到的相同，但是我们将对它们单独地进行讲解。Although they follow the same basic pattern mentioned above, television receivers will be dealt with separately.

9.爱肯机的速度受到了限制是由于它使用了继电器而不是电子器件的缘故。

Aiken’s, machine was limited in speed by its use of relays rather than electronic devices.

10.由于太空中没有大气，所以科学家们可以利用太空望远镜观察到距离我们达140亿光年远的光源，这些光源比地球上最大的光学望远镜所能见到的光源还要远大约六倍。

The absence of atmosphere in space will allow the space telescope to show scientists light sources as far as 14 billion light years away, some seven times farther out than those visible to the biggest ground-based optical telescope.

11.二氧化碳及其他污染物的不断增加，导致全球温度上升，这一现象就称为全球性变暖。Increasing levels of carbon dioxide and other pollutants are responsible for a rise in global temperature, a phenomenon called global warming.

12.作者不可能要求（求知欲）热切的人们放慢速度来阅读他们应该读的书籍。

The author can’t require eager people to slow down and read the books they ought to read.

13.压力每增加一个大气压，其体积就缩小百万分之二十。

Its volume decreases by 20 parts per million for a pressure increase of 1 atmosphere.

14.如果半径减半的话，流速就降为原来的1/16（即降了15倍）。

If the radium is halved, the flow rate is reduced by a factor of 16.

15.与普遍的观念相反，人类对睡眠的需求并不是随年龄的增长而减少。

Contrary to popular belief, human don’t need less sleep as they age.

16.这个容器内的压力为零点零几个大气压。

The pressure in this container is a few hundredths of an atmosphere.

17.海水的比热比空气大三倍。

The specific heat of sea water is four times greater than that of air.

18.我们必须求出为提起这个重物需要多大的力。

We must find out how large a force is required to lift this weight.

19.在常温下，一些水会变成水蒸气，这一现象被称为蒸发。

At room temperature, some water will change into vapor, a phenomenon called vaporization. 20.由于计算机运算精确、速度快，所以得到了广泛的应用。

Accurate in operation and fast in speed, computers have found wide applications.

1.锂原子并不像氟原子那样彼此能够形成分子。

Lithium atoms do not form molecules with each other in the way that fluorine atoms do.

2.随着我们对它的工作情况的描述的深入，这一点会变得越来越明显。

This will become more obvious as we proceed with a description of its operation.

3.对变化的灵敏度高达0.1度的传感器调整着每个房间里的温度和湿度。

Sensors sensitive to a change as small as 0.1degree adjust the temperature and humidity in each room.

4.遗憾的是，巴比伦人并不像我们现在分割一天那样把圆分成24份来获得它们的基本单位。It is a pity that the Babylonians did not divide the circle into 24 parts, as we now divide the day, to obtain their basic units.

5.大气压精确为105帕被称为1巴，而其千分之一大小的大气压是1毫巴。

A pressure of exactly 105Pa is called one bar, and a pressure one thousandth as great is one millibar.

6.第二个以及随后的触发器的翻转频率为第一个的一半或更低。

The second and subsequent flip-flops toggle at frequencies one-half or less that of the first.

7.在了解这个方程的时候，并没有用到那个已知量。

In solving this equation no use was made of that given quantity.

8.所有这些值并非都能满足那个方程。

All these values cannot satisfy that equation.

9.有多少个自变量就有多少个一阶偏导数。

There are as many partial derivatives of the first order as there are independent variables.

10.真正的预报需要考虑的气候因素要多得多。

The real forecast must take into account far more climate factors.

11.非常省时以及其他的优点，足以弥补附加的测试设备的成本。

The great time saving and other advantages more than justify the cost of the added test equipment.

12.这种类型的存储器件往往被称为寄存器，它是由数字计算机的应用而得来的一个名称。Storage devices of this type are often called registers, a name derived from digital computer applications.

13.我们可以把这两种矢量（读者会注意到这两种矢量均为极坐标形式）应用于任何的网络特性。

We could apply these two vectors, which it will be noticed are in polar form, to any network characteristic.

14.两个纵坐标AB和CD之间的距离越短，这种近似的误差就越小。

The error in this approximation will be smaller the shorter the distance between the two ordinates AB and AD.

15.我们会看到每个存储单元少到只有1-2个字节的计算机。

We may see computers with as few as 1 or 2 bytes per memory unit.

16.这个参数随温度的变化很小。

The variation of this parameter with temperature is very small.

17.这台设备主要是由五部分构成的。

This device consists mainly of five parts.

18.普通的窗户均承受不了这么大的力。

No ordinary windows can withstand so large a force.

19.对这些设备必须很好地加以利用。

Good use must be made of these devices.

20.平板越大，你得到的电容量就越大。

The larger the plate, the greater capacitance you will have.

1.像银和铜这样的材料内部含有很多自由电子，而其他的一些材料内部几乎没有自由电子。Certain materials, such as silver and copper, have many free electrons. And some materials have practically（几乎）no free electrons.

2.把电动势加到一条导线的两端，就会有许多自由电子沿导线传输，进而电流产生了。When an emf（电动势）is applied across two ends of a wire, many free electrons progress（前进）along the wire and a current results.

3.现在我们进一步求一下这个单位阶跃函数的微分。

Now let us go one step further and differentiate the unit step function.

4.电阻率越大，创建一个给定的电流密需要的电场越强，换句话说，电场强度给定，电流密度随电阻率的增大而减小。

The greater the resistivity（电阻率）, the greater the field（电场）needed to establish（建立）

a given current density（密度）, or the smaller the current density caused by a given field.

5.电脑在遥测这样的系统中尤其有用，在这类系统中，信号要求被快速记录下来否则就会丢失。

Computers are particularly useful in such systems as telemetry（遥测）, where signals must be quickly recorded or be lost.

6.两根平行的(parallel) 橡皮筋(rubber band) 所提供的力为一根橡皮筋的两倍。

The force provided by two parallel rubber bands is twice (as large as) that provided by one rubber band.

7.电灯产生的热比它产生的光多得多。

An electric lamp produces much more heat than it does light.

8.PN结两端存在一个电容，它的存在经常引发一些问题。

There is a capacitance（电容）across the PN junction（结）. And its existence causes some problems at high frequencies. ( its existence ≈it exists)

9.傅氏变换是一种非常有用的工具，它在工程当中有广泛应用，然而等式2-1的限制条件限制了它在一些重要情形中的应用。

The Fourier transform（傅氏变换）is a very powerful tool that is used to a great extent in engineering. However, the limitation defined by Eq. (2 –1) restricts its use in important situations .

10.这些微波以每秒1000个的速率发射持续时间小于百万分之一的脉冲。

These microwaves（微波）are emitted（发射）in pulses（脉冲）of less than one millionth of a second duration（持续时间）at a rate of 1,000 per second .

11.每个处于正常状态的原子，质子数等于电子数，这一现象直接取决于质子和电子的电属性。

In every atom in its normal state, the number of protons（质子）equals the number of electrons, something [ = a fact] which is directly related to the electrical properties of the proton and the electron .

12.据预测，去年RCA展示的壁挂式电视新技术将会在1990年推向消费市场。

Last year RCA demonstrated（展示）a new technique for a wall-hung TV that it was predicted would be on the consumer market “close to 1990.”

13.数字信号传输不需要有模拟信号传输那么高的信噪比。

Digital transmission need not have as high an S/N ratio. [可看成省去了“as analog transmission”]

14.这一个力产生的加速度是另一个力产生加速度的两倍，那么这个力是另一个力的两倍。

A force which causes a body to have twice the acceleration（加速度）another force produces must be twice as great.【省略as another force】

15.大多数重要的仿真书既具有教育性，又具有宣传性。

Most of the important simulation books are as much propagandist as educational.

第一章

1.铁的导电性不如铜的好

Iron is not as good a conductor as copper.

2.我们发现正在解决的是非常庞大的一类电路。

We find that we are dealing with too large a class of circuits.

3.在爬山的时候，我们都是选择一个平缓的坡度而不选择陡峭的坡度来爬，这种本能的行为是基于斜面原理的。

So instinctive（本能的）an act（行为）as choosing a gradual（平缓的）slope（坡度）of a hill （小山）to walk up instead of a steep（陡峭的）slope is based on the principle of the inclined plane （斜面）.

4.对每个作用力，必定存在一个大小相等，方向相反的反作用力。

To every action there must be an equal and opposite reaction.

5.在x轴上，正值处于原点的右边

On the x-axis, positive values are to the right of the origin.

6.这些脉冲以每秒几百个到每秒上万个的速率发射出去。

These pulses are emitted at the rate of from a few hundreds to many thousands per second.

7.由于在线圈中存在铁芯，使磁感应增强到线圈处于真空时的5500多倍。

The presence of the iron in the coil has increased the magnetic induction to over 5,500 times what it would be if the coil were in vacuum.

8.骨头能吸收的X射线比柔软的皮肤和肌肉组织吸收的多得多。

Bones absorb the X rays much more than do the soft skin and muscle tissue.

9.中国国际广播电台China Radio International

10.所有的电路，不论大小，都含有同种元件。

Large or small, all the circuits will contain the same kinds of components.

11. In Chapters 9 to 14, inclusive, the detailed design of each of the components shown in Fig. 1-4 is treated.

第9章到第14章（第9章和第14章均包括在内）中，对图1-4所示的每个部件的详细设计作了论述。

12. In the absence of any friction, the pulse started by the hand in Fig.8 would continue down the rope undiminished.

在没有摩擦的情况下，图8-1中由手产生的脉冲就会沿着绳子传下去而不会减弱。

13.The absence（不存在）of atmosphere（大气）in space will allow the space telescope（望远镜）to show scientists light sources as far as 14-billion light years away, some seven times farther out than those visible to the biggest ground-based optical（光学的）telescopes.

空间中大气的缺失使得科学家能通过太空望远镜观察到距离14亿光年远的光源，这一距离是最大的地面光学望远镜所能观察到的距离的7倍（这一距离比最大的地面光学望远镜所能观察到的距离高6倍）

第二章

1.Great efforts are made in industry to minimize friction through the use of lubricants, notably grease and oil, and special devices, notably the wheel.

工业上做了极大的努力，通过使用润滑剂（特别是润滑脂和润滑油）和专门的装置（特别是轮子）来把摩擦降到最小的程度。

2.盐水是一种混合物，它是由盐和水两种化合物构成的。

Salt water, a mixture, is made up of two compounds, salt and water.

3.速度是长度与时间之比，其量纲为L/T。

Velocity, the ratio of length to time, has the dimensions L/T.

4.Living things too, it now seems certain, obey（遵循）the laws of physics and chemistry.

生物也同样遵循物理化学定律，这一点现在看来是可以肯定的。

5．The machine seems to do many tasks which one would have thought required intelligence.

机器能做许多我们曾认为需要一定智力才能完成的工作。

第三章

1.负号的存在表明，1.5安培的电流是从C流向F，而不是如图上所示的从F流向C.

The presence of the minus sign indicates that the current of 1.5A flows from C to F, and not from

F to C as shown.

2. 未来，多数的远程通信将会是计算机对计算机的，而不是像现在的人对人的。

The majority of distance communication in the future could well be computer-to-computer, not person-to-person as at present.

3.The Maxwell relations（关系式）are not modified（修正）by relativity（相对论）as Newton’s relations are when particle（质点）velocities approach the speed of light .

当质点的速度逼近光速时，麦克斯韦关系式并不能像牛顿关系式那样可以通过相对论进行修正。

4. 这个力的方向应该是怎么样的？

What should be the direction of this force?

5. 假定地球具有它现有的质量，然而全部由质子组成的话，那么电子的逃逸速度为多大？If the earth had its present mass, but were composed entirely of protons, what would be the escape velocity of an electron.

第四章

1. It is perfectly possible for one body to have a greater moment of inertia than another even though its mass may be much the smaller of the two.

即使一个物体的质量可能比另一个物体小得多，但它具有的转动惯量完全可能比另一个的大。

2.The more branches added in parallel，the less opposition there is to the flow of current from the supply source.

并联的支路越多，对由电源产生的电流流动所呈现的阻力就越小。

3. The spacing between magnetic lines of force is smaller the stronger the field.

磁场越强，磁力线之间的间隙就越小。

4.声音在氢气中传播，要比在空气中快得多。

Sounds travels much more rapidly in hydrogen than in air.

5.轻的气体，例如氢，在相同的压力下要比空气稀得多。

A light gas, such as hydrogen, is much less dense than air is at the same pressure.

6. 随着带宽的不断增加，数字电平显示得越来越精确。

As the bandwidth increases, the digital levels are more accurately portrayed.

7. 平板相互靠得越近，保持的电荷量就越多。

The closer the plates are to one another, the greater amount of charge is held.

8. Java与其说是一种编程语言，不如说是一种技术。

Java is more a technology than a programming language.

9.在电工学中所遇到的所有函数中，也许最重要的一种是正弦曲线

Of all the functions encountered in electrical engineering, perhaps the single most important one is the sinusoid.

10.水的氢原子数为氧原子的二倍。

There are twice as many hydrogen atoms as oxygen atoms in water.

11.蒸汽机的效率没有汽轮机高。

The steam engine is not as efficient as the steam turbine.

12.It is possible to measure the passage of as few as 60 electrons per second with a certain sensitive device.

使用某种灵敏的设备，能够测出每秒钟少到只有60个电子通过。

13.Anyone reading this book will find the author’s final speculation as challenging as they are far-reaching.

阅读本书的每一位读者都会发现，作者提出的那些最后的推测既有深远意义，又具有挑战性。

第五章

1.储存器中的每个地址分配了一个号码。

Each address in memory is assigned a number.

2.在这种情况下，我们说该分子被场极化了

In this case, the molecule is said to become polarized by the field.

3. Given how far the car has gone, we can determine the amount of time that was required if its speed is constant.

已知小汽车行驶的距离，若其速度恒定的话，我们就能确定它所需的时间。

4. The pull of gravity W is stubbornly vertical. This can easily be taken care of by resolving W into components parallel to the slope and perpendicular to it.

重力的拉力W总是垂直的。这一点可以通过把W分解成与斜面平行和垂直的分量就能容易地得到满足。

The air throughout the room becomes heated by convection currents（对流的气流）.

The gate（门电路）will remain closed by the low input until the clock pulse

arrives.