1、计算机在工作之前必须被告知要做什么。
Before it can work, a computer must be told what to do . 2、所有金属受热时都会融化。
When they get hot, all metal melt.
3、在物理学家们研究电学的时候，他们把空间任何一点的电场强度 定义为：E=Flq。
1、我们用欧姆表来度量电阻。 We measure resistance in ohms.
2、频率是用赫兹为单位来度量的 Frequency is measured in hertz. 3、他们代表了用这两个位置数表示的两个关系式。 They represent two relations in these two unknowns.
1、在这种情况下，每个部件基部的压力是相同的，所以该系统处于 平衡状态。
In this case, the pressure at the base of each component is the same and therefore the system is in equilibrium.
2、在b点，我们得到Vb=Va-El，因此E=（Vb-Va）\l。
四、With+某些抽象名词=这些名词对应的副词
1、交流电可以极其容易地被转变成直流电. AC can be changed into DC with great ease. 2、这个电流是随着电阻的增大而减小的。 The current decreases with the increase in resistance. 3、半导体的电导率随温度而变化。 The conductivity of a semiconductor varies with temperature.
五、by的使用
1、这时电流增加了9倍 At this point the current has increased by a factor of 10.
2、这种情况下，v和i相差90° In this case v and i differ in phase by 90°.
六、“in”的使用(1)
2、下面的两个方程极为重要。 The two equations below are of great importance. 3、上面的那些方程都是微分方程。 The equations above are all differential equation.
九、副词做状语的位置
1、该设备主要有五部分组成。 The device consists mainly of five parts. 2、每个分子的平均动能只取决于温度而不取决于压力、体积或分子的种类。 The average kinetic energy per molecule depends only on the temperature
a hole. 3、速度被定义为距离与时间之比。 Speed is defined as the ratio of distance to time.
十五、缩略词的复数形式应该放在缩略词点之前
1、图1-2和图1-3说明了这一过程。 Figs.1-2 and 1-3 show this process. 2、式（2-5）和（2-6）是非常有用的。 Eqs. (2-5) and (2-6) are very useful. 3、基础好的读者可以跳过第一第二第三章。 The well-grounded reader may skip Chaps.1,2 and 3.
十六、名词短语做前置定语
1、犹他大学的人造臂质量很好。 The university of Utah artificial arm is good in quality. 2、我们能把增益提高一个因子。 We can make an order of magnitude improvement in gain. 3、他们相差一个因子2. They have the factor of 2 difference.
3、该电阻器上的电压为原来的五分之三。 The voltage across this resistor three fifths what it was.
*表示倍数增长的一个常用句型
4、概数值几乎比理想值大了3.5倍。 This value is nearly 4.5 times greater than the ideal one. 5、该信号被放大了10倍 The signal has been amplified by a factor of 11.
3、在交流电路中的阻抗起的作用与在直流电路中电阻起的作用是一样的。
Impedance in an ac circuit plays the same role that/as resistance does in a dc circuit.
八、副词做后置定语的情况
1、大脑必须与周边世界接触。 The brain must keep in touch with the world around.
Technical English
Writing
一、使用“and”的情况
1、这个电源字母表是由A、B、C、D 四个符号组成的。 he source alphabet consists of four symbols A, B, C and D. 2、该电路是由一个电池、一个电阻和一个电容器构成的。 This circuit consists of a battery, a resistor and a capacitor.
In there study of electricity, physicists defined the electric field intensity E at a point in space as E=Flq
十三、名词短语做后置定语
1、六年后，我们将会有手表那样大小的计算机了。 In six years, we will have a computer the size of a watch. 2、氧的质量约为氢的16倍。 Oxygen has a mass about 16 times the mass of a hydrogen atom. 3、这里m是不为零的任意数。 Here m is any number not zero.
3、应该选择电阻R1、R2、RL、Re ，使得该晶体管能够线性工作。 The resistor R1、R2、RL and Re are to be chosen so that the
transistor operates linearly.
二、在“therefore, hence, thus, however, so”等副词开头的一 个并列分句前一般应该加“and”，或者加一个分号。要不然就把 这句话改成一个单独的句子。
At point b, we have and hence
Vb=Va-El E=（Vb-Va）\l
三、倍数、分数的连接用法
1、这个电压是加给放大器的信号的100倍。 This voltage is 100 times the signal applied to the amplifier. 2、其速度为光速的三十分之一。 Its speed is three tenths that of light.
2、栅极之所以能做到这一点主要是由于他特别靠近阴极。
This the grid is able to do primarily because of its great proximity to the cathode.
3、由于该电路结构简单，所以广泛用于电源中。
Because of its simplicity, this circuit is widely used in power supplies.
“in”的使用(2)
1、输出脉冲的宽度和形势与输入脉冲是相同的。 The output pulse is identical in form and width to that of the input. 2、E是这两个状态的能量差。 E is the difference in energy between the two states. 3、这台机器的速度受到限制。 This machine is limited in speed. 4、这些设备的体积各不相同。 These devices differ greatly in size.
“in”的使用(3)
1、我们能够测出压力的微弱变化。 We can measure the slight change in pressure.
2、接入Re会引起放大量的降低。 The inclusion of Re causes a decrease in amplification. 3、这条线的斜率为1: 9. This line has a slop of 1 in 9.
七、代动词“do, does”的使用
1、欧姆定律适用于有机组织的程度与它适用于导线和电阻的程度是一样 的。
Ohm’s law applies to tissues as well as it does to wires and resistors.
2、中子数可能是不同的，而且往往是不同的。
The number of neutrons may vary and often does.
十四、名词与介词的一种搭配模式
1、温度对金属导电率的影响是很小的。 The effect of temperature on conductivity of metals is small. 2、硅原子中缺少一个电子，可以看成是一个空穴。 The absence of an electron from a silicon atom can be thought of as
十一、物主代词与其修饰的词之间的三种逻辑关系