专业英语5研究.ppt

2）形容词转换为汉语名词 Most materials used in engineering are elastic. 工程中所用的大多数材料都具有弹性。（而不说“是弹性的”） Computers are more flexible, and can do a greater variety of jobs. (汉语不说“计算机是更灵活的”，把“灵活的”改译成“灵活性”) 计算机的灵活性比较大，因此能做更多种不同的工作。 Jet engines are very powerful. 喷气发动机的功率非常大。(若将“Powerful ”译为强大的，未能表达“功率”这一概念，使词义不明确。) The microscope serves to render the small larger. 显微镜能使小物体变大。(the small 转换成名词“小物体”) 2）动词转换为汉语副词 In the long and laborious search, Marie Curie succeeded in isolating two new substances. 在长期辛勤的研究中，玛利．居里成功地分解出两种新物质。（动词succeed 转译成副词“成功地”） 3）名词转换为汉语副词 Gears may be form cut on a milling machine. 齿轮可以在铣床上成形切削。（form 修饰 cut） Most of machine parts are mass produced. 大多数机器零件是批量生产的。（mass 修饰 produced） Several cutters are arbor mounted on the spindle of a milling machine. 铣床主轴上可借助刀杆装上几把铣刀。（arbor 修饰 mounted） Lesson5 Keys, Couplings and Seals A Key is the machinery component placed at the interface between a shaft and the hub of a power-transmitting element for the purpose of transmitting torque (see Figure 1.6(a)).The key is demountable to facilitate assembly and disassembly of the shaft system. It is installed in an axial groove machined into the shaft, called a keyset. 键是一种位于轴和动力传递的轮毂之间用于传递扭矩的机械零件（参见图1.6（a））。键是可拆卸的，以方便轴系统的装配和拆卸。它安装在一个轴向槽加工成的轴，称为键槽。 A similar groove in the hub of the power-transmitting element is usually called a keyway, but it is more properly also a keyset. The key is typically installed into the shaft keyset first; then the hub keyseat is aligned with the key, and the hub is said into position. 一个类似的在动力传输元素间枢纽凹槽，通常被称为键沟，但更恰当的应该叫键槽。键通常被首先安装到轴的键槽，然后轮毂键槽与键对齐，轮毂就安装到位了。 1.Square and Rectangular parallel Keys The most common type of key for shafts up to 6.5 inches in diameter is the square key, as illustrated in Figure 1.6(b).The rectangular key (illustrated in Figure 1.6 (c)) is recommended for larger shafts and is used for smaller shafts where the shorter height can be tolerated. Both the square and the rectangular keys are referred to as parallel keys because the