英译汉练习

试译下列各句，注意划线词的词义选择或引申
1. Power can be transmitted over a great distance with practically negligible loss if it is carried by electric current. ⒈用电流输送动力，能以几乎微不足道的损耗把它送到很远的地方去。 2. These drugs are used to treat nine serious medical conditions. ⒉这些药品可用来医治九种严重的疾病。 3. A trial run is needed before the machine is put into operation. ⒊机器投入运行前，须先行试车。 4. An intricate network of the computer system runs this modern petroleum refinery. ⒋电子计算机系统的复杂网络管理着这个现代化的炼油厂。 5. Locomotives and diesel trucks and ship engines run on a heavy grade of fuel. ⒌机车、柴油载重车和船用发动机靠烧重油运行。 6. Here I discontinue my relation of the American Civil War. ⒍现在我们言归正传，不谈美国内战了。 7. The study of the brain is one of the last frontiers of human knowledge and of much more immediate importance than understanding the infinity of space or the mystery of the atom. ⒎对大脑的研究是人类知识的最新领域之一，它比研究无垠的宇宙和神秘的原子更迫切、更重要。 8. The beauty of lasers is that they can do machining without ever physically touching the material. ⒏激光的妙处就在于它能对材料进行非接触加工。 试将下列各句译成汉语，注意词量或句量的增减
1. Friction always manifests itself as a force that opposes motion. ⒈摩擦总是表现为一种阻碍运动的力。 2. A list of all the ways that diesel power is used would take pages. ⒉一份列举柴油机所有用途的清单可能要好几页。 3. Geology is a synthesis of the natural sciences: astronomy, biology, chemistry, mathematics, and physics. ⒊地质学是下列各种自然学科的综合科学：天文学、生物学、化学、数学和物理学。 4. For every action there is an equal and opposite reaction. ⒋每一个作用力都有一个大小相等，方向相反的反作用力。 5. In Figure 5, A is the resistance, L the distance and C the effort. ⒌图5中，A表示阻力，L表示距离，C表示作用力。 6. In the absence of friction, belts would not be capable of conveying power from one machine to another. ⒍没有摩擦力，皮带就不能将动力从一台机器传送到另一台。 7. The heat energy that we get from the sun may be changed into other forms of energy. ⒎我们从太阳得到的热能可以转变为其它形式的能。 8. The mass of one unit of volume of a material is called its density. ⒏物质单位体积的质量称之为密度。 9. They tried vainly to blame us for the damage of the machine. ⒐他们企图把机器损坏的过失强加在我们身上，但未能得逞。 10. Between the two ends of the wire, there is a potential difference, making the electrons flow along the wire. ⒑导线两端之间存在电位差，它

使电子沿导线流动。 11. Sulfuric acid, which is much stronger, is so corrosive that it is seriously damaging to the human skin. ⒒硫酸的酸性要强得多，因而具有很大的腐蚀性，会严重损伤人的皮肤。 12. His father had a small business in the city of Pisa. This city is in the north of Italy near the sea. ⒓他的父亲在意大利北部沿海的比萨做小生意。 13. Up to now, it is only the rocket which can propel a space vehicle. ⒔迄今为止，只有火箭才能推进宇宙飞行器。 14. Up to now, there is no fuel or chemical reaction known that could produce the sun’s heat and light. ⒕至今，尚无已知的燃料或化学反应能产生象太阳那样的光和热。 15. Bees and dolphins communicate, but they do not have language. ⒖蜜蜂和海豚各自的同伴间能进行信息交流，但它们都没有语言。

18.? ?The machine did not stop because the fuel had run out.
⒙这台机器不是因为燃料用完而停止运转。

19.? ?All the heat energy in the steam engine is not used because the steam has not fully expanded when it is ejected from the cylinder.
⒚蒸汽机的热能并未全部利用，因为蒸汽从汽缸中排出时没有充分膨胀。

20.? ?The importance of the research project on automatic controls cannot be overestimated.
⒛这项有关自动控制的科研项目的重要性，怎么估计也不过分。

21.? ?A helicopter can deliver goods and passengers to places which could not possibly be reached by an ordinary plane.
21.直升飞机能把货物和旅客运到普通飞机根本到不了的地方。

22.? ?This new therapy is especially effective on patients who simply cannot tolerate any more radiation therapy because of side effects.
22.这种新疗法对于因副作用而简直无法再忍受射线疗法的病人尤其有效。

23.? ?There is no material but will deform more or less under the action of force.
23.在力的作用下，没有一种材料不或多或少地发生形变。

24.? ?The charging of a condenser from a battery is not unlike the filling of a tank from an oil reservoir.
24.电池给电容器充电就象油罐给油箱加油一样。

25.? ?When the cutting speed is over 500 meters per second, cutting temperatures decrease rather than increase.
25.当切削温度超过每秒500米时，切削温度下降而不是上升。

26.? ?Instead of losing hope, he kept on doing experiments with greater fervor until final success.
26.他并未失望，而是以更大的热情投身于试验，直至最后成功。