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9. All the computers in our laboratory are not very good in quality. 10. The students are familiar with none of these parameters. IV、

1. In Section 1-2, the concept of force was introduced. 2. As early as the 1940s, it was found that semiconductors are very useful. 3. This result can also be arrived at in another way. 4. At that time no use was made of this phenomenon. (…, this Phenomenon was made no use of.)

5. This point will be dealt with in the next section. V、

1. This machine works much better than that one (does). 2. This computer requires many more components that that one (does). 3. Macros have far fewer uses in C++. 4. The distance of the moon from the earth is as great as 240,000 miles. 5. The greater the resistance, the longer time it takes for the capacitor to reach its maximum voltage. (…, the longer time is required for the capacitor to reach its maximum voltage.)

6. The farther the body is thrown, the greater force will be required. 7. Calculate how many more seconds are required for the wheel to come to rest [stop].

8. Of all the instruments in this laboratory, this one is the lowest in price […, this one is the cheapest].

9. Sound travels in hydrogen much faster than in air. 10. This astronomical observatory is the largest in our country. 11. The current as small as 0.1 A is too small to produce enough heat. VI、

Many different methods can be used to resolve compounds into their elements. Sometimes, but not often, heat alone is sufficient. Joseph Priestley, an English chemist, discovered oxygen 200 years ago. A more common method of resolving compounds into elements is called electrolysis. This involves passing an electric current through a compound, usually in the liquid state. Through the process of electrolysis, it is possible to separate water into the two elements hydrogen and oxygen. VII、

1. It is easy for us to determine the weight of the body. 或：We can determine the weight of the body easily.

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2. Air exerts pressure in all directions. 3. Both the engineers are busy (in) designing a new type of computer. 4. We find this concept very difficult to explain. 5. None of these windows can withstand so large a force. 6. Substituting Eq. (1-7) in [into] Eq. (1-8), we obtain [have; get] the following relation. [ Substituting (Substitution of) Eq. (1-7) in Eq. (1-8) yields [produces; gives; results in; leads to] the following relation.]

7. Sound travels less fast than light does. 8. Work equals [is equal to] force multiplied by distance. 9. This equipment has a few advantages all its own. 10. The results obtained agree with the experimental values. [… are in agreement with the experimental values.]

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II、

1. All we need to do is (to) measure the pressure on the body. [或：All that is necessary is to measure …; It is only necessary for us to measure …; We need only to measure ….]

2. It is quite possible for them to solve this equation. 3. It will take a few months to design this kind of aircraft with the help of a computer. 4. If it is desired to find out this force, we may use the parallelogram method.

5. It is left as a problem to [for] the reader to show that this expression hold. 6. The program to be executed is stored in this unit. 7. This valley acts as the foundation on which to build the dam. 8. In this laboratory there are many kinds of instrument for students to choose from.

9. Atoms are too small for us to see with our naked eyes. 10. Let it be required to find out this component. 11. Let t0 equal [be equal to] zero. 12. The farther away the target (is), the longer time it takes for the echo to return. 13. We find this problem easy to solve. 12 / 43

14. It is necessary to solve this equation for x.

15. For the series to converge, x must be less than 1. 16. We find this concept very difficult to understand. 17. This method makes it much easier to detect targets. 18. Time-shared systems are expensive to build. 19. This factor will affect the ability of a computer to store information. 20. We have to find out how large to make r so as for the series to converge. 21. This is a pen to draw pictures with. 22. For the transistor to conduct, its base must be about 1.8 volts. 23. Elasticity is the tendency of a body to return to its original condition after being deformed. 24. An antenna is a device to transmit and receive radio waves.

25. The lack of such protection has made it easy for malicious programs to destroy data on systems. 26. These problems deserve to be further studied.

27. We consider it necessary to make measurements with accuracy. 28. R is the resistance to be measured. 29. Each member has a switch with which to indicate a YES or NO vote. 30. Ordinary matter is said to be electrically neutral. 31.This property makes it possible for metals to be made into any shape. 32. This table is unfit for a student to do experiments on. 33. Now we consider what path of integration to take. 34. In this case, the time necessary for the current to reach its maximum value is changed. 35. The purpose to write this book is to give the reader a brief introduction to electronic computers. III、

The period with which a body undergoes simple harmonic motion is the time required for it to make one complete oscillation. In the case of a spring [For a spring], the period is the time the spring spends in going from its maximum extension, through its maximum compression and back to its maximum extension once more. For all types of simple harmonic motion, the period T is given [expressed; denoted; represented] by T = 2πS/a,

where the acceleration a is that experienced by the body when it is at its specified position.

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IV、

1. The sine law of the variation of the cylinder diameter with light intensity has been emphasized.

2. Our method is different from those described [presented] in the papers available on [discussing] the same problem.

3. To do all this, a sound knowledge of computer science is necessary. […, it is necessary to have a sound knowledge of computer science.]

4. Not only do temperature and light affect the conductivity, but the addition of impurities to semiconductors also makes it change greatly. 5. Various satellites are frequently launched to obtain information about [on] space. 6. Our semiconductor industry came into being at the end of the 1950s. 7. Direct current flows always in one direction. 8. My colleagues and I would like to express our thanks to Professor W. Smith for his great help.

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II、

1. The compressed air has the ability to do work. 2. The presently existing integration methods do not apply [hold] here. 3. The amplifier amplifies the received signals. 4. Moving molecules have kinetic energy. 5. Fig. 1 – 3 shows the photo of a freely falling body. 6. Speed equals distance divided by time. 7. Voltage equals current multiplied by resistance.

8. The resistance of air increases with the increased [increasing] speed. 9. A transformer is a device consisting of two or more coils wound on [round] an iron core. 10. It is necessary to find out the current flowing through this component. 11. This book, properly used, will be of great help to the reader. 12. Flowing through a circuit, the current will lose part of its energy. 13. In this case, electrons have more energy, (thus) increasing the brightness of the light spot. 14. Given [Knowing] time and speed, we can find out distance. 14 / 43

15. Having studied this chapter, the student will understand the principle of a computer.

16. The speed of light being extremely great, we cannot measure it by ordinary methods.

17. Several comsats were launched, all of them (being) high-altitude satellites. 18. Called “the mother of all networks,” the Internet is a widely used international network.

19. The angle in radians, being defined as the ratio of a length to a length, is a pure number.

20. This force can be resolved into two components, one (being) horizontal and the other vertical. III、

1. With the switch closed, the balance point is found by trial and error. 2. With both speakers on, what is the intensity at C? 3. The Internet Protocol was not designed with security in mind. 4. Let us construct [draw] a circle with the origin as the center and of radius R.

5. The equation to the circle of radius r with the center at the origin is x2 + y2= r2.

6. This parameter should be measured with E grounded. 7. Its Fourier transform can be obtained from Eq. (2 – 4), with the lower limit replaced by zero. 8. With no resistance in the circuit, the current will increase indefinitely. 9. With no input present, the output will be zero. 10. With this in view, we have written this book. IV、

1. Let us consider designing a voting machine. 2. Blood is capable of being broken down into various components. 3. Multiplying a and b together to give e may be written as a×b = e. 4. We refer to these components as being passive. 5. A cell reproduces by dividing in two. 6. This involves taking the Fourier transform. 7. The light beam will be deflected upon entering the medium. 8. On rearranging the above equations, we obtain the following set of equations.

9. In using this equation, it does not matter which plane is considered as 15 / 43