? Our experiment was finished two weeks ahead of schedule.我们的试验比计划提
前两周完成。 ? Our machine was imported from Japan, and theirs was from Germany.我们的机
器是从日本进口的，他们的（机器）是从德国进口的。
? Our primary purpose in studying fatigue is to understand why failures occur so that we can guard against them in an optimum manner.我们研究疲劳的主要目的在于了解产生失效的原因，以便能以最佳的方式加以预防。 ? Our space and time laws don’t seem to apply to objects in the area of black hole.
我们的空间和时间定律似乎不适用于黑洞地区内的物体。 ? Oxidized metals can be reduced, or separated from nonmetals, and in that way be
made pure again.氧化了的金属可以还原，也就是可以与非金属分离，从而又变成纯金属。
?
P
ackaged software is developed to serve the specific needs of one user.软件包
的开发只是为某一用户的特定需要服务。
? Part of the immune reaction against AIDS or any virus is that the lymph nodes
enlarge.淋巴肿大是对艾滋病或任一种病毒的免疫反应。 ? Penicillin works by not allowing a bacterium to build its cell wall.青霉素的作用
是不让细菌制造细胞壁。 ? People have no idea of what radioactivity was until Madame Curie discovered
radium.在居里夫人发现镭以前,人们并不了解放射性. ? People who live in the areas where earthquakes are a common occurrence should
build houses that are resistant to ground movement.居住在地震多发地区的人们应该建造能够抗震的房屋。（该句包含由who, where, that引导的三个限制性定语从句） ? People would probably have to take so much Valium to jolt their pacemakers that
the cure would ve worse than the disease.为了突然改变自己的整律器，人们很可能需要服用大量安定，只是用药的结果比疾病本身更糟。 ? Perhaps the most common classification of material is if the material is metallic
or non-metallic.也许，材料最常见的分类是根据它是否是金属还是非金属来进行的。（if引导表语从句） ? Perhaps the most common classification of material is whether the material is metallic or non-metallic.也许，材料最常见的分类是根据它是金属还是非金属来进行的。 ? Phosphorus has an undesirable effect on steel in that it imparts brittleness. 磷对
钢有不良的影响,因为它会使钢变脆。(in that引导原因状语从句)
? Photoelectrons appear as soon as the light is switched on.只要光一照射，就立即
产生光电子。 ? Physics studies force, motion, heat, light, sound, electricity, magnetism, radiation,
and atomic structure.物理学研究力、运动、热、光、声音、电、磁、辐射和原子结构。 ? Practically, all the heat energy received by the earth comes from the sun.实际上，
地球所得到的几乎全部的热能都来自于太阳。 ? Properly speaking, not all substances exist in three states.确切地说，并非所有的
物质都有三种状态。 ? Provided that the casting has one completely flat surface, the pattern can be made
in one piece.如果铸件有一个面是完全平的，模型就可以做成一个整体。 ? Providing that we know both the current and resistance, the voltage can be
calculated.知道了电流和电阻，就能求出电压。（省译了providing that） ? Pure copper wires have very low resistance, which is why they are so much used in electric circuits.纯铜线具有很低的电阻，这就是为什么在电路中大量使用的原因。（why引导表语从句） ? Putting two and two together, he came to the conclusion that mechanical energy is different from electrical energy.他根据事实推断出一个结论：机械能部等同于电能。
?
Q
uantum chemistry is in its infancy.量子化学仍处于发展初期。
? Quasi-stars were discovered in 1963 as a result of an effort to overcome the
shortcomings of radio telescopes.类星体是1963年发现的，是人们努力克服射电望远镜的缺点所取得的一项成就。 ? Quasi-stars were discovered in 1963 as a result of an effort to overcome the
shortcomings of radio telescopes.类星体是1963年发现的，是人们努力克服射电望远镜的缺点所取得的一项成就。
?
R
adiation can be very intense, as it is used in the treatment of cancer , or very
weak as it is emitted by a TV set.辐射可能很强，如用于治疗癌症的那种辐射；也可能很弱，如电视机所放射的那种辐射。
? Radio waves are similar to light waves except that their wavelength is much
greater .无线电波与光波相似，但无线电波的波长要长很多。 ? Rapid evaporation tends to make the steam wet.快速蒸发往往使蒸汽的湿度加
大。
? Rapid evaporation tends to make the steam wet.快速蒸发往往使蒸汽的湿度加
大。 ? Root system performs supporting, absorbing, conducting, etc.根系起着支撑、吸
收、传导等功能。（动词supporting，absorbing和conducting后增译名词“功能”）
?
S
cientist have discovered that the brain can make its own drug.科学家们已经
发现，大脑能够制造它自己需要的药物。
? Scientists believe that a way to improve the power of the brain may soon be possible.科学家们深信，不久便有可能找到一种方法来改善大脑的功能。 ? Self-pollinated forms are likewise less variable than those that must be
cross-pollinated.同样，自花授粉植物比异花授粉植物变异机会要少。 ? Shell type reamers sacrifice some rigidity and accuracy.套式绞刀多少会降低刚
度和精度。 ? Shorts frequently develop when insulation is worn.绝缘被磨损时往往会发生短
路。 ? Simple in principle, the experiment led to a scientific revolution with far-reaching
consequences.这个实验虽然原理简单，却导致了一场影响深远的科学革命。 For reasons the alternating current is more widely used than the direct current.由于种种原因，交流电比直流电用得更为广泛。 ? Since metal is fusible, it will change into liquid when the temperature is high
enough.由于金属是可熔的，所以当温度相当高时，它就会熔为液体。 ? Since numerical control was adopted at machine tools,the productivity has been
raised greatly.自从机床采用数控以来，生产率大大提高了。 ? Since that time many workers have used coconut milk as a source of nutrients for
culturing embryos and other tissues and organs. 从那以后，许多工作者用椰乳作营养液培养胚及其他的组织和器官。（动名词作介词宾语） ? Since the generating units work well here, we will import the same.既然这里的发动机组运行良好，我们也将进行相同的发动机组。 ? Six vacuum filters will be required to handle waste streams.需要六台真空过滤
器处理废液。 ? Small doses of woxins induce a host to manufacture anti-toxins.小剂量的霉素能
使受体产生抗霉素。 ? Small in size, this apparatus can lift a weight as heavy as 500 kilograms.这个设
备虽然很小，但是它可以举起重达五百公斤的重物。 ? Smoking detector located in each elevator lobby over the elevator call button.每
个电梯间的呼叫按钮上方有烟火探测器。
? Solid walling is built both externally and internally, mainly to enclose areas and
support the weight of floors and roofs of building.实体墙分为外墙和内墙。它们分别用于分割房间或承担建筑中楼层和屋盖的荷载。 ? Solids vary in other ways as well as hardness.各种固体不及硬度不同，别的方面
也不同。 ? Some of quasi-stars lie near the limits of observable space and time, and promise
to provide a crucial test of rival theories of universe.有些类星休接近人们所能观察到的空间和时间极限，因而有可能用来对彼此对立的宇宙理论作出有决定意义的检验。 ? Some oil products are given special treatment at the refinery.有些石油产品在炼
油厂经过专门的处理。 ? Some speculate that drug abuse, chronic stress, or intestinal parasitic infections
may weaken the immune system and allow AIDS a foothold.还有一些研究人员认为，滥用药物、长期精神照张或肠道寄生虫感染，会削弱免疫系统，从而给艾滋病以立足点。 ? Sometimes the heating effect in the circuit is rather weak as if there were no
current in it.有时电路的热效应相当弱，好像其中没有电流似的。 ? Special purpose machine tools should be designed to be able to perform one
operation, or a sequence of operations, repetitively, on a special part.应该将专用机床设计成能对一种专用零件重复进行一道或数道工序的加工。 ? Speed and reliability are the chief advantages of the electronic computer.速度快，
可靠性高是电子计算机的主要优点 ? Spiders are not insects, as many people think, nor even related to them.与许多人
所想的相反，蜘蛛并不属于昆虫类，甚至于昆虫没有近亲关系。或：蜘蛛并不像许多人所想的那样属于昆虫类，它甚至与昆虫没有近亲关系。 ? Stamp wires and cables at intervals of not more than 3 inches along their entire
lengths.沿电线及电缆的全线上，至少每隔三英寸打印一个记号。 ? Steel , which is strong in tension, is used to counteract the tensile forces in loaded
beams.钢由于其抗张力很强，可用来抵消承载梁的张力。（非限制性定语从句转译为原因状语从句） ? Strength is an inherent property of a material or of a mechanical element.强度是
一种材料或一个机械零件的固有特性。 ? Such current may form, disappear, or change flow direction within a matter of
hours or days.这些洋流的形成、消失和改变流向可能发生在大约几小时或几天内。
? Such observations must be processed before we can utilize them.我们能应用这
些观测资料之前，必须对它们进行处理。 ? Such plants have evolved to depend on hummingbird rather than insects as
pollinators.此类植物已经演变成依靠蜂鸟，而不是依靠昆虫来传授花粉。 ? Such systems should include a complete monitoring system of water flow tied
into the control station.这样的（灭火）系统还应包括一个与中央控制站连接的完备的水流控制系统。 ? Superconducting material can be used to transmit d.c and a.c power.超导材料可
以用来传输直流电和交流电。 ? Sure enough, 80 percent of the plants developed the disease.果然，80%的庄稼都
染上了这种病。
?
T
will represent temperature alone in this book unless otherwise stated.在本书
中T将只表示温度,除非另有说明。
? That heat flows from a hotter to a cooler body is a process of energy transfer. It
tends to equalize temperature.热从高温区体流向低温物体是一个能量传递过程。这个过程使温度趋于平衡。 ? That heat flows from a hotter to a cooler body is a process of energy transfer
tending to equalize temperature.热从高温物体流向低温物体是一个能量传递过程，它使温度趋于平衡。 ? That is the reason for which the expansion of liquid takes place on the surface
only.那就是为什么液体膨胀只发生在表面的原因。 ? That like charges repel but opposite charges attract is one of the fundamental law
of electricity.同性电荷相斥，异性电荷相吸是电学的一个基本规律。 ? The “weightless” condition of astronauts in orbit about the earth arises from just
this cancellation of inertial and gravitational force.围绕地球旋转时宇航员的“失重”状态，就是由于关系里与引力相互抵消的结果。 ? The accumulation of more and more details of the process leads to a more and
more accurate explanation of its mechanism.有关该过程的细节积累越来越多，对其机制的解释就越来越精确。 ? The adjustment screw has stops at both sides.调整螺钉的两端设有定位块。 ? The aim of this project is to develop a second-generation integrated decision
support system.本项目的目的是开发第二代综合决策支持系统。 ? The air resistance on an automobile is one of the reasons why fuel consumption
per mile is greater at higher speeds.空气对汽车的阻力是为什么车速较高时每英里的耗油量较大的原因之一。