●A black hole exerts a strong gravitational pull and it has no matter.黑洞产生很强的吸引力，可是它没有物质。
●A calorie is defined as the quantity of heat required at one atmosphere to raise the temperature of one gram of water through 1℃，usually from 14.5℃ to 15.5℃.一卡路里定义为在一个大气压力条件下，使一克水温度增加1℃所需要的热量，通常是指从14.5℃ t提高到15.5℃。
●A chicken is a suitable specimen for the study of the general external features of a bird.鸡是研究禽类外部特征的合适范例。
●A collection of data is called a data set, and a single observation a data point.一批数据叫数据集，（而）单个观测结果叫数据点。
●A computer is a device which takes in a series of electrical impulses representing information, combines them, sorts them, analyses and compares the information with that stored in the computer.计算机是一种装置，该装置接受一系列含有信息的电脉冲，对这些电脉冲进行合并，整理，分析，并将它们与储存在机内的信息进行比较。
●A computer work many times more rapidly than nerve cells in the human brain.计算机工作起来比人类大脑中的神经细胞要快很多倍。
●A cork floating on water is not swept along with the water. Rather, it moves up and down with the wave motion.漂在水面上的软木塞没有随波流走。相反，它随波上下浮动。
●A deep wound, where the supply of blood and oxygen has been cut off, is the perfect place for certain kinds of bacteria to grow.深的伤口是某些种类的细菌孽生的理想场所，因为那里的供血和供氧被切断。(译为原因状语从句)
●A drilled hole can be made accurate and smooth by a? reamer.钻好的孔可用铰刀加工，使其尺寸精确，表面光滑。
●A few people were infected with the AIDS virus through blood transfusions.曾有少数人通过输血传染上艾滋病毒。
●A fly wheel stores energy and evens out fluctuations in the speed of the engine.飞轮可储存能量，因此可使发动机的速度波动平稳下来。
●A force involves direction as well as magnitude.一个力不仅有大小，而且有方向。
●A liquid is made to circulate through pipes in the refrigerator, picking up heat from the food.是某种液体在冰箱的管子中环流，从而带走食物中的热量。
●A material object cannot have a speed greater than the speed of light.一个物体的速度绝不会超过光速。
●A milky white fluid called lymph carries impurities and waste away from the tissues and passes through gland-like structures spaced throughout the lymphatic system that act as filtering valves.淋巴，一种乳白的液体，把（人体）各组织内的杂质和代谢废物带走，并通过腺状结构——这些腺状结构分布在所有的淋巴系统内——起着过滤网的作用。
●A new type of car is now being developed powered by anhydrous ammonia.目前正在研制一种新型的以无水氨作为动力的汽车。
●A pilot may have crossed so many time zones, and taken so many irregular breaks, that he himself does not know when natural night is.飞行员可能越过很多时区，无规律的休息过
许多次，因此连他们自己也不知道什么时候是他们的自然夜间。（when 引导宾语从句）
●A polymer is a substance of high molecular weight, well above the size of the compounds considered so far.聚合物是一种高分子的物质，其大小远远超出迄今所提到的各种化合物。
●A port is a harbor with the necessary terminal facilities to speed up the moving of cargo and passengers.港口是船只停泊处，有各种必要的终端设备以加速客货流通。
●A power reactor has no need of air, for the heat generated in the uranium pile is the result of unclear fission, not of combustion.动力反应堆不需要空气，因为在铀堆中产生的热室核裂变而不是燃烧的结果。
●A second panel that will visuslly display any alarm condition in the building can be provided in the Mechanical System Control Office.机械系统控制办公室有另一个仪表板，将清楚地显示楼内的任何险情。
●A special fund has been set up to help these nations use new chemicals and technology.已经建立了特殊基金资助这些国家使用新的化学品和新技术。
●A substance which consists entirely of the same kind of atoms is called an element.完全由同一种原子构成的物质称为元素。
●A valuable instrument may be damaged beyond repair in a few second of carelessness.由于疏忽大意，重要的仪表可在几秒之内被损坏到无法修复的程度。
equals不等于
●A wave model is considered as a good model of the way in which light behaves.波动模型是说明光的性能的一个很好的模型。（省译了is considered）
●A wider range of monitor sizes is sought after than ever before.与以前相比，人们追求更大范围的不同的显示器尺寸。
●About 20 kilometers thick, this giant umbrella is made up of a layer of ozone gas.地球的这一巨型保护伞由一层臭氧组成，其厚度约为20公里。
●According to the periodic table, there seem to be still some elements undiscovered.根据周期表，似乎还有一些未被发现的元素。
●Acid rain, ozone, and other consequences of these pollutants are affecting plant and animal life.酸雨、臭氧和这些污染引起的其他后果正影响着植物和动物的生存。
●Administrative personnel should be mathematically informed if they are to make wise decision.管理人员要做出明智的决策，就应该懂得数学。
●Adverse to iron, mercury is in a liquid state at ordinary temperature.水银与铁不同，在常温下是液态。（省译了in）
●Aerodynamics is my field of research.我的研究领域是空气动力学。（主表倒译）
●After all its merits, the alloy does not measure up to the requirements.这种合金尽管有许多优点，但还是不符合要求。
●After the spring has been closed to its solid height, the compressive force is removed. 弹簧被压缩到并紧高度之后，就没有压力了。

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