科技英语复习资料（来源：老师授课用PPT）一．汉译英1.本文介绍了热能制冷技术和燃料电池工作原理及其特点。
针对燃料电池汽车余热浪费大特点，提出了利用其余热制冷为燃料电池汽车空调提供冷源方法，并对其可行性进行了研究。
This paper introduces the work principles and features of fuel cell as well as refrigeration technique driven by heat energy. Considering the present fact that a large amount of heat of fuel cell automobile is wasted, this paper proposes the program of providing the cold source for the automobile air-conditioner with the refrigeration driven by the wasted heat and studies the feasibility of it.2.只有通过对该系统性能研究，我们才能了解它优点。
Only through the study of the performance of the system, we can understand its advantages.3.叶片装在铣床上。
Vanes stand on the milling machine.4.十五年前，电子战在朝鲜战争中偶有应用。
Fifteen years ago, electronic warfare saw only sparse service in Korea.5.如果我们测得地震波走时和振幅，我们就能够确定地下几何形状并估算与岩石速度和密度有关声阻抗。
Seismic measurements of travel time and amplitude define the subsurface geometry and give estimates of the acoustic impedances related to rock velocities and densities.6.我们在分析破损材料时，通常需要先做直观判断，再做实际试验。
Analysis of a damaged material usually requires intuitive judgment followed by real-life testing.7.电子计算机之所以效率高，是由于其运算速度快，而且计算准确。
The effectiveness of the electronic computer lies in its great speed and accuracy in calculation.8.即使我们将普通食盐溶于水，也不能改变其化学性质。
Even the dissolution in water cannot enable common salt to change its chemicalproperties.9.活塞与汽缸配合间隙，对于发动机使用寿命影响很大，影响配合间隙主要因素是活塞在工作状态下变形。
真实反映活塞变形情况，国内已广泛采用有限元法进行数值分析。
Since the joint gap between a piston and a cylinder has great influence on the service life of an engine, and the primary factor influencing the joint gap is the deformation of piston under working condition, it is important to show up the actual deformation of piston and for this purpose the finite element method has been widely applied to analyze it numerically in China.10.本文将Q过程重新分类，得到每类Q过程存在、唯一性准则以及一般表达式，我们结果在过程构造及定性理论，特别在含瞬时效Q过程构造及定性理论中有重要应用。
In this paper, Q-processes are classified in a new method and the existence and uniqueness as well as the forms of each class of Q-process are obtained. The result obtained has important application in the construction and qualitative theory of Q-processes, especially, in that of instantaneous state Q-processes.11.本文对一个主跨400m大型混凝土斜拉桥在汽车与人群载荷下状态进行了非线性分析，给出了全桥各控制截面力学量非线性影响系数。
分析表明这类桥非线性影响系数可达15%左右。
In this paper, a large concrete cable-stayed bridge with a 400-meter-long main span under the loads of vehicles and human groups is analyzed by nonlinear theory and the nonlinear influence factors of mechanical quantities at controlling sections of the bridge are evaluated. It shows that the nonlinear influence factors of this kind of bridge may reach about 15%.12.近40年来，在大量工程设计实践中，我院积极采取新技术、新材料和新设备，荣获部优、省优设计奖25项。
In recent 40 years, the designers of the institute have actively adopted new techniques, new building materials and new equipment in their design practice. As a result, the institute has won 25 prizes for excellent designs awarded by the Ministry and the Province.13.本文介绍了CAPP系统中自动生成和输出工序图基本方法，并重点论述了比例设置、剖面线绘制，尺寸、公差、粗糙度标注等基本问题，其中剖面线绘制方法是比较独特、新颖和通用方法。
In this paper, a basic method of automatic creation and output operation figure in CAPP is introduced. The emphasis is laid on setting proportion, drawing section line, indication of size, tolerance and roughness and other basic problems, among which the method of drawing section line is not only distinctive and novel but also of universal use.14.谁也不清楚问题当然需要详细讨论。
This problem that nobody knows how to solve needs to discuss in detail.二、英译汉1. Electricity can be measured in amount and quality.电可以用数量和质量来度量。
2.Instrument transformers are installed on the high-voltage equipment.互感器安装在高压设备上3.Electric power is generated in power generating stations or plants.电能是在发电站或发电厂产生4.Electrical energy can be stored in two metal plates separated by an insulation medium. Such a device is called a capacitor, and its ability to store electrical energy is termed capacitance. It is measured in Farads.电能可以储存在被一绝缘介质隔开两块金属板中，这样装置被称为电容器，它储存电能能力就被称为电容。
电容测量单位是法拉。
5.The signal should be filtered before being amplified.放大信号前，应先对其进行滤波6.Once being placed in the sun, an object becomes hot.物体放置在太阳下会变热。
7.Before designing a new electronic product we must do various experiments.在设计一个新电子产品之前，我们必须做各种实验8.Changing resistance is a method for controlling the flow of the current.改变电阻是控制电流一种方法9.Conducting electricity means the flow of electrons through an object.传导电流意味着电子在物体内流动10.The power supply shown in block-diagram in Fig.1 is a single-phase switch-mode inverter.图1中用框图表示电源是一个单相开关逆变器11.A three-phase circuit, as pointed out above, is merely a combination of three single-phase circuits.正如上面所指出那样，三相电路只不过是三个单相电路组合。