专业英语重点句子(带单词翻译版)

Unit 1 (5个)

1.Materials science and engineering (MSE) is an interdisciplinary field concerned with inventing new materials and improving previously known materials by developing a deeper understanding of the microstructure-composition-synthesis-processing relationships.

2.Materials scientists and engineers not only deal with the development of materials, but also with the synthesis and processing of materials and manufacturing processes related to the production of components.

3.One of the most important functions of materials scientists and engineers is to establish the relationships between a material or a device’s properties and performance and the microstructure of that material, its composition, and the way the material or the device was synthesized and processed.

4.In materials science, the emphasis is on the underlying relationships between the synthesis and processing, structure, and properties of materials.

5.In materials engineering, the focus is on how to translate or transform materials into

a useful device or structure.

Unit 2（3个）

6.What is also fascinating about van der Waals forces is that they begin as inter actions between atoms and molecules that ultimately lead to considerable forces between fine particles of any material.

7. We make use of metal and ceramic powders (dry or slurries) in processing many ceramic and metallic materials through routes collectively known as powder processing (Processing technique for metals involving the solid-state bonding of a fine grained powder into a fully dense product).

8.We can accomplish this by introducing like charges on the particles (electrostatic stabilization) or adsorbing soap like surfactant molecules on the surfaces of particles (steric stabilization).

Unit 3（8个）

9.The Si-O bond in the SiO44- structure in about 50 percent covalent and 50 percent ionic according to calculations from Pauling’s equation.

10.The tetrahedral coordination of SiO44- satisfies the directionality requirement of covalent bonding and the radius ratio requirement of ionic bonding.

11.If two corners of each SiO44-tetrahedron are bonded with the corners of other tetrahedra, a chain or ring structure with the unit chemical formula of SiO32- results.

12.Silicate sheet structure form when three corners in the same plane of a silicate tetrahedron are bonded to the corners of three silicate tetrahedra.

13.The mineral['m?n?r?l](矿物的,矿物)kaolinite['ke??l?na?t](高岭石)consists (in its pure form) of every small, flat plates roughly hexagonal[hek's?ɡ?n?l](六边的，六角形的) in shape, with their average size being about 0.7um in diameter[da?'?m?t?](直径) and 0.05 um thick.

14.Another example of a sheet silicate is the mineral talc[t?lk](滑石；云母), in which a sheet of Mg3(OH)24+ bonds with two outer-layer Si2O52- sheets (one on each side) to form a composite['k?mp?z?t](复合的；合成的)sheet with the unit chemical formula['f??mj?l?](公式,方程式) Mg3(OH)2(Si2O5)2.

15.Crystalline['kr?st(?)la?n](结晶的)silica exists in several polymorphic[,p?l?'m??f?k](多态的)forms that correspond to different ways in which the silicate tetrahedral are arranged with all corners shared.

16.The most stable forms of silica and the temperature ranges in which they exist at atmospheric pressure are low quartz[kw??ts](石英) below 573℃, high quartz between 573 to 867℃, high tridymite['tr?d?ma?t](鳞石英)between 867 and 1470℃, and high cristobite[kris't?u,b?lait](方石英) between 1470 and 1710℃.

Unit 4（15个）

17.Point defects(点缺陷)are localized['lok?'la?zd](局部的；地区的；小范围的) disruptions[d?s'r?p??n](破坏) in otherwise perfect atomic or ionic arrangements in a crystal structure.

18.These imperfections, may be introduced by movement of the atoms or ions when they gain energy by heating, during processing of the material, by introduction of impurities, or doping[dop](掺杂).

19.An important "point" about point defects is that although the defect occurs at one or two sites, their presence is "felt" over much larger distances in the crystalline material.

20. When atoms or ions are missing (i.e., when vacancies are present), the overall randomness['r?nd?mn?s](随意；无安排；不可测性) or entropy['entr?p?](熵) of the material increases, which increases the thermodynamic[,θ??m??da?'n?m?k](热力学的) stability of a crystalline material.

21.V acancies['vek?nsi](空位)play an important role in determining the rate at which atoms or ions can move around, or diffuse[d?'fju?z](弥散,扩散)in a solid material, especially in pure metals.

22.If we conduct(管理；引导；表现) this sintering['s?nt?r??](烧结) treatment in a reducing or inert atmosphere (e.g., hydrogen or nitrogen), some of the oxygen ions from BaTiOa will leave the material in the form of oxygen gas.

23.In some cases, we can introduce vacancies at specific ion sites so as to enhance the movement of ions in ceramic materials, which can help sinter ceramics[?n'hɑ?ns](提高；加强；增加) at lower temperatures.

24.At room temperature(~298K), the concentration[k?ns(?)n'tre??(?)n](集中,浓度)of vacancies is small, but the concentration of vacancies increases exponentially[,?kspo'n?n??li](以指数方式)as we increase the temperature, as shown by the following Arrhenius type behavior:

25.Interstitial[,?nt?'st??(?)l](间质的；空隙的；填隙的)atoms or ions，although much smaller than the atoms or ions located at the lattice['l?t?s](晶格；格子) points，are still larger than the interstitial sites that they occupy; consequently, the surrounding crystal region['ri?d?(?)n](范围) is compressed and distorted[d?s't?rt?d](扭曲).

26.Interstitial atoms such as hydrogen['ha?dr?d?(?)n](氢)are often present as impurities; whereas[we?r'?z](然而；鉴于；反之) carbon atoms are intentionally added to iron to produce steel.

27.If there are dislocations(变位；位移；断错) in the crystals trying to move around these types of defects, they face a resistance to their motion, making it difficult to create permanent deformation(永久性变形) in metals and alloys.

28.Substitutional[,s?bst?'tj???nl](置换)atoms or ions may either be larger than the normal atoms or ions in the crystal structure, in which case the surrounding inter-atomic spacings are reduced, or smaller causing the surrounding atoms to have larger inter-atomic spacings.

29.Whether atoms or ions added go into interstitial or substitutional sites depends upon the size and valence of guest atoms or ions compared to the size and valence of host ions.

Unit 5（10个）

30.Semiconductors(半导体) which do not contain appreciable[?'pri???b(?)l](可感知的；可评估的；相当可观的)levels of dopants or impurities are known as intrinsic[?n'tr?ns?k](本质的，固有的)semiconductors, When we add small concentrations of P or B to silicon crystal, these atoms occupy crystallographic[,kr?st?lɑ'ɡr?f?k](结晶的) sites where silicon atoms usually reside(住，居住；属于).

31.The result is each P atom added has one "extra" electron that cannot pair with a Si atom to form a fifth Si-P bond.

32.The entire microelectronics[,ma?kr???lek'tr?n?ks]微电子学) industry, as we know it today, would not exist if we did not have a good understanding of the diffusion of different atoms into silicon or other semiconductors.

33.Strong covalent[,ko'vel?nt](共价的)and ionic bonds along with microstructural features contribute to the relatively poor electrical conductivity exhibited[?g'z?b?t] by many ceramics.

34.The ability of ions to diffuse and provide a pathway for electrical conduction plays an important role in enabling these applications.

35.This is one of the major reasons why we use polyethylene terephthalate (PET聚对苯二甲酸乙二醇酯) to make bottles which ensure that the carbonated beverages['bev(?)r?d?](饮料) they contain will not loose their fizz(兴奋，活力；嘶嘶声；充气饮料) for a reasonable period of time.

36.In reality, aluminum[?'lju?m?n?m]oxidizes['?ks?da?z](氧化)(rusts) more easily than iron. However, the aluminum oxide (Al2O3) forms a very protective but thin coating on the aluminum’s surface preventing any further diffusion of oxygen and hindering(妨碍) further oxidation of the underlying aluminum.

37.We distinguish[d?'st??gw??](区分)between the movement of atoms, molecules['mɑl?,kj?l], ions, electrons, holes, etc. as a result of concentration gradient['gre?d??nt](梯度)and temperature (diffusion) or some other driving force, such as gradients in density['dens?t?](密度), electric field, or magnetic field gradients.

38.This equation is derived from(来自，源自于) a statistical analysis(统计分析) of the probability that the atoms will have the extra energy Q needed to cause movement. 39.The disorder vacancies create (i.e., increased entropy) helps minimize the free energy and, therefore, enhance the thermodynamic stability of a crystalline material.

40.In chapter 3, we have seen that for many ceramics with ionic bonding the structure can be considered as close packing(密集流水) of anions(阴离子)with cations(阳离子；正离子) in the interstitial sites.

41.At higher temperatures, the thermal['θ??m(?)l](热的)energy supplied to the diffusing atoms permits the atoms to overcome the activation energy(活化能) barrier and more easily move to new sites in the atomic arrangements.

Unit 6（9个）

42.Since melting, casting, and thermomechanical[,θ?:m?umi'k?nik?l](热] 热机的，[热] 热机械的)processing is not a viable['va??bl](可行的；能养活的；能生育的)option for polycrystalline[,pɑl?'kr?st?'la?n](多晶)ceramics, we typically process ceramics into

useful shapes starting with ceramic powders.

43.In this process, the green ceramic is heated to a high temperature, using a controlled heat and atmosphere, so that a dense material is obtained.

44.Powders consist of particles that are loosely bonded, and powder processing involves the consolidation[k?n,s?l?'de???n](巩固；合并；团结) of these powders into a desired shape.

45.In some cases, very large pieces (up to a few feet in diameter and six to eight feet long) can be produced using a process called cold isostatic pressing (CIP冷等静压制) where pressure is applied using oil.

46.Similarly, large pieces of metals and alloys compacted['k?mp?ktid]( . 压实的；压紧的) using CIP can be sintered under pressure in a process known as hot isostatic pressing (HIP热等静压；高温等静力压制).

47.Some recent innovative['?n?vet?v](革新的，创新的)processes that make use of microwaves (similar to the way food gets heated in microwave oven) have also been developed for the drying and sintering of ceramic materials.

48.Some ceramics, such as silicon nitride['na?tra?d](氮化物) (Si3N4), are produced by reaction bonding(反应粘合).

49.Reaction bonding, which can be done at lower temperatures, provides better dimensional[d?'men??n?l](空间的,尺寸的)control compared with hot pressing; however, lower densities and mechanical properties are obtained.

50.This mixture has a clay(粘土)-lake consistency[k?n's?st(?)ns?](一致性；稠度；相容性), which is then fed to an extruder[?k'strud?](挤出机；挤压机) where it is mixed well in a pug mill(搅拌机), sheared[???d](修剪), deaerated[di'?ret](出去空气), and then injected(注入的) into a die(冲模，钢模；骰子)where a continuous shape of green ceramic is produced by the extruder.

Unit 7（2个）

51.The combination of transparency[tr?n'sp?r(?)ns?](透明，透明度)and hardness at room temperature along with sufficient(足够的；充分的) strength and excellent corrosion [k?'r???(?)n](腐蚀)resistance to most normal environments make glasses indispensable for many engineering applications such as construction and vehicle glazing(上釉；玻璃装配业).

52.However, in borosilicate[,b??r??'s?l?ke?t]glasses(硼硅酸盐玻璃) that have additions of alkali['?lk?la?](碱；可溶性无机盐)and alkaline earth(碱土金属) oxides, BO33- triangles can be converted(转化) to BO44- tetrahedra, with the alkali or alkaline earth cations providing the necessary electroneutrality.

Unit 8（14个）

53.It reacts relatively quickly with water, and in normal Portland cements(波特兰水泥，硅酸盐水泥，普通水泥) is the most important of the constituent[k?n'st?tj??nt](成分；选民；委托人)phases for strength development; at ages up to 28 days, it is by far the most important.

54.The rate at which it reacts with water appears to be somewhat variable, perhaps due to differences in composition or other characteristics, but in general is high initially[?'n??(?)l?](起初的) and low or very low at later ages.

55.The standard specifications(标准技术规范；标准规格) with which such cements(水泥；胶合剂) must comply[k?m'pla?](遵守) are similar, but not identical[a?'dent?k(?)l](同一的；完全相同的), in all countries and various names are used to define the materials, such as Class 42.5 Portland cement in current European and British standards (42.5 is the minimum 28-days compressive strength in MPa), Type I and II Portland cement in the ASTM (American Society for Testing and Materials) specifications used in USA, or Ordinary Portland Cement(OPC) in former British standards.

56.Standard specifications are, in general, based partly on chemical composition or physical properties such as specific surface area, and partly on performance tests, such as setting time or compressive strength developed under standard conditions.

57.The content of MgO is usually limited to 4%--5%, because quantities of this component in excess of about 2%can occur as periclase (magnesium oxide), which through slow reaction with water can cause destructive expansion of hardened concrete['k??kri?t](具体物；凝结物).

58.Many other minor['ma?n?](次要的,未成年的) components are limited in content by their effects on the manufacturing process, or the properties, or both, and in some cases the limits are defined in specifications.

59.Rapid-hardening Portland cements have been produced in various ways, such as varying the composition to increase the alite['eilait](硅酸三钙石；A-水泥石) content, finer grinding['ɡra?nd??](磨的) of the clinker['kl??k?] (渣块；炼砖), and improvements in the manufacturing process, e.g., finer grinding or better mixing of the raw materials.

60.The alite contents of Portland cements have increased steadily over the one and a half centuries during which the latter have been produced, and many cements that would be considered ordinary today would have been described as rapid hardening only a few decades ago.

61.For both ordinary and rapid-hardening cements, both lower and upper limits may be imposed on(利用；欺骗；施加影响于) strength at 28 days, upper limits being a safeguard against poor durability[,dj?r?'b?l?ti](耐久性；坚固；耐用年限)resulting from the use of

inadequate[?n'?d?kw?t](不充分的，不适当的) cement contents in concrete.

62.Destructive expansion from reaction with sulfates['s?lfet](硫酸盐)can occur not only if the latter are present in excessive[?k'ses?v](过多的，极度的) proportion(比例) in the cement, but also from attack on concrete by sulfate solutions.

63.The reaction involves the Al2O3-containging phases in the hardened cement, and in sulfate-resisting Portland cements its effects are reduced by decreasing the proportion of the aluminate phase, sometimes to zero.

64.The reaction of Portland cement with water is exothermic[,eks?(?)'θ??m?k](发热的), and while this can be advantage under some conditions because it accelerates hardening, it is a disadvantage under others, such as in the construction of large dams or in the lining of oil wells, when a cement slurry(水泥渣) has to be pumped over a large distance under pressure and sometimes at a high temperature.

65.lower heat evolution[,i?v?'lu??(?)n](演变；进化论；进展) can be achieved by coarse [k??s](粗糙的)grinding, and decreased total heat evolution by lowering the contents of alite and aluminate.

66.The ASTM specifica tions include definitions of a Type II or “moderate heat of hardening” cement, and a more extreme Type IV or “low heat” cement.

Unit 9（无）

Unit 10（7个）

https://www.sodocs.net/doc/5418116706.html,posites(复合材料) are combinations of two materials in which one of the materials, called the reinforcing[,ri?n'f?rs](增强的) phase, is in the form of fibers(纤维), sheets, or particles and is embedded[?m'bed](栽种,嵌入)in the other material, called the matrix['me?tr?ks](基质) phase.

68. If the composite is designed and fabricated['f?br?,ket](制造，组装)correctly, it combines the strength of the reinforcement with the toughness(韧性；强健；有粘性) of the matrix to achieve a combination of desirable properties not available in any single conventional material.

69.Because of the variety of available reinforcement and matrix materials, as well as the ability to combine them in a wide range of volume['v?lju?m] fractions['fr?k?(?)n](体积分量), composites can be produced with a broad range of properties, notably['not?bli](显著的) elastic[?'l?st?k] modulus['m?dj?l?s] (弹性系数；弹性模数), strength, and toughness combinations.

70.A composite is a combination of a reinforcing phase present in the form of particles, whiskers, or fibers in a matrix that holds the discrete[d?'skri?t]( . 离散的，不连续的) reinforcement pieces together and provides them with lateral support.

71.Many composites occur naturally。

72.Examples include wood, which essentially(本质上；本来) consists of cellulose

fibers(纤维素纤维)in a matrix of hemicellulose[hem?'selj?l??z](半纤维素)and

lignin['l?gn?n](木质素); and bones, which are composites of soft protein['pr??ti?n](蛋白质)collagen['k?l?d?(?)n](胶原质)and hard minerals called apatites['?p?ta?t](磷灰石).

https://www.sodocs.net/doc/5418116706.html,posite materials have been developed in response to the need for man-made materials with unusual combinations of properties such as high specific strength (i.e., high strength-to-density ratio) and stiffness['st?fn?s](僵硬；坚硬) in one direction, or a combination of high strength and toughness not available from any single material.

自动化专业英语课文重点句子翻译(精)

In the case of a resistor, the voltage-current relationship is given by Ohm’s law, which states that the voltage across the resistor is equal to the current through the resistor multiplied by the value of the resistance. 就电阻来说, 电压—电流的关系由欧姆定律决定。欧姆定律指出:电阻两端的 电压等于电阻上流过的电流乘以电阻值。 2]It may be that the inductor voltage rather than the current is the variable of interest in the circuit. 或许在电路中,人们感兴趣的变量是电感电压而不是电感电流。 Viewed in this light, it will be found that the analysis of three-phase circuits is little more difficult than that of single-phase circuits. 这样看来,三相电路的分析比单相电路的分析难不了多少。 At unity power factor, the power in a single-phase circuit is zero twice each cycle. 在功率因数为 1时,单相电路里的功率值每个周波有两次为零。 It should be noted that if the polarity of point Awith respect to N ( is assumed for the positive half-cycle, then when used in the same phasor diagram should be drawn opposite to, or 180? out of phase with, . 应该注意,如果把 A 点相对于 N 的极性(定为正半周,那么在用于同一相量图中时就应该画得同相反,即相位差为 180? One problem with electronic devices corresponding to the generalized amplifiers is that the gains, AU or AI, depend upon internal properties of the two-port system. 对应于像广义放大器这样的电子装置,一个问题就是增益 AU 或者 AI ,它们取决于两输入端系统的内部特性。

专业英语考试词汇翻译

可以确保90%以上正确，个别差错敬请谅解 1. Feedback ; 反馈 2. Error ；误差 3. Open-Loop；开环 4. Automatic Control System；自动控制系统 5. Sensor；传感器 6. Actuator；执行器 7. Valve；阀 8. Control Strategy；控制策略 9. Positive feedback；正反馈 10. Set point；设定值 11. Inertia；惯性 12. Centrifugal；离心的 13. steam engine；蒸汽机 14. mathematical model ；数学模型 15. Routh Stability Criteria ；劳斯稳定性判据 16. linear system ；线性系统 17. amplifier ；放大器 18. response ；响应 19. artificial；模拟的，人造的 20. industrial robot；工业机器人 21. Maximum principle；最大值原理 22. Dynamic；动态的 23. Neural network control；神经网络控制 24. Fuzzy control；模糊控制 25. Predictive control；预测控制 26. Programmable Logic Controller；可编程序逻辑控制器（PLC） 27. Distributed Control System；分布式控制系统28. Fieldbus Control System；现场总线控制系统 29. Supervisory Control Software；监控软件 30. Configuration Software； 组态软件 31. object；目标 32. V ariable Structure control ；可变结构控制 33. Sliding-mode control；滑 模控制 34. Proportional ；比例 35 Integral；积分 36. Derivative；微分 37. offset；补偿 38. Avoid overshoot；避免超 调 39. performance；性能 40. logic；逻辑 41. function；功能 42. Triangle function；三角 函数 43. Trapezoid function；梯形 函数 44. robots；机器人 45. Instruction ；指令 46. Relay；继电器 47. Processor；处理器 48. Wiring；布线 49. mechanisms；机械装置 50. nut；螺母 51. bolt；螺栓 52. concept ；概念，观念 53. weld ；焊接 54. spray ；喷雾器 55. communicate；通讯，传 递 56. orbit；轨道 57. install ；安装 58. metal ；金属 59. plastics；塑料 60. rubber；橡胶 61. electronics；电子 62. packaging；封装 63. complexity；复杂 64. millimeter；毫米 65. asynchronous；异步的 66. accurate；精确 67. debug；调试 68. slot；槽口 69. armature；电枢 70. iron core；铁芯 71. eddy；涡流 72. flux；磁通量 73. conductor；导体 74. commutator；换向器 75. brush；电刷 76. stator；定子 77. rotor；转子 78. bearing；轴承 79. aluminium铝 80. slip ring；滑环 81. copper；铜 82. torque；转矩 83. opposite；相反 84. wound；绕组，缠绕 85. squirrel cage rotor；鼠笼 转子 86. insulate；隔离 87. embedded；嵌入式 88. cylindrical；圆柱体 89. salient；凸出的 90. magnetic field；磁场 91.efficiency；效率 92. permanent magnet；永磁 铁 93. gear；齿轮 94. twisted ；缠绕 95. characteristic ；特性 96. proportional to ；与。。。 成比例 97. flux density ；磁通密度 98. common mode voltage ； 共模电压 99. diameter；直径 100. piston；活塞 101. Motion control ；运动 控制

(完整版)医学专业英语翻译及答案

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