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,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,上节课内容,1.1 科技英语的特点,(1)复杂长句多,(2)被动语态多,(3)非谓语动词多,本节课内容,1.2 科技英语的特定结构及句型,It-that-,结构；,as,结构；,with,结构；,省略结构；,Be,句型；,Have,句型。,It-that-结构,It is evident that a well lubricated bearing turns more easily than a dry one.,显然，润滑好的轴承比不润滑的轴承容易转动.,It-that-结构,It seems that these two branches of science are mutually dependent and interacting.,看起来这两个科学分支是相互依存，相互作用的.,It-that-结构,It has been proved that induced voltage causes a current to flow in opposition to the magnetic force producing it.,已经证明，感应电压使电流的方向与产生电流的磁场力方向相反。,It-that-结构,It was not until the 19th century that heat was considered as a form of energy.,直到十九世纪人们才认识到热是能量的一种形式。,1.2 科技英语的特定结构及句型,It-that-,结构；,as,结构；,with,结构；,省略结构；,Be,句型；,Have,句型。,as结构,Computers may be classified as analog and digital.,计算机可以分为模拟和数字两种.,as结构,This steel alloy is referred to as the best available here.,人们称这种合金钢是这里所能提供的最好的合金钢。,as结构,Electromagnetic waves travel at the same speed as light.,电磁波传播的速度和光速相同。,as结构,Microcomputers are very small in size,as is shown in Fig.5.,如图5所示，微型计算机体积很小。,as结构,In water sound travels nearly five times as fast as in air.,声音在水中的传播速度几乎是在空气中传播速度的五倍。,1.2 科技英语的特定结构及句型,It-that-,结构；,as,结构；,with,结构；,省略结构；,Be,句型；,Have,句型。,with结构,With a given resistance,the current is directly proportional to the electromotive force.,对一定的电阻来说,电流与电动势成正比。,with结构,Iron rusts when it unites with oxygen from the air.,当铁跟空气中的氧相结合，就会生锈。,with结构,The discovery of quarks with a charge smaller than an electron charge will shake the foundation of modern physics.,夸克带有的电荷小于一个电子的电荷，这一发现将动摇现代物理学的根基。,with结构,Both practical design techniques and theoretical problems are covered with emphasis on general concepts.,（本文）既讲了实际的设计方法，又讲了理论问题，而重点放在一般概念上。,with结构,For a conventional motor,even with 95%efficiency,80kW would be lost as heat.,一台传统的电动机，即使效率达95%，也将以热能的形式损失80千瓦电能。,with结构,I cant concentrate on my work with so many machines making so much noise.,由于机器噪音太大，我的精力难以集中在工作上。,1.2 科技英语的特定结构及句型,It-that-,结构；,as,结构；,with,结构；,省略结构；,Be,句型；,Have,句型。,省略结构,An object,once in motion,will keep on moving because of its inertia.,物体一旦运动，就会因惯性而持续运动。,省略结构,All substances,whether gaseous,liquid or solid,are made up of atoms.,一切物质，不论是气态、液态，还是固态，都由原子组成。,1.2 科技英语的特定结构及句型,It-that-,结构；,as,结构；,with,结构；,省略结构；,Be,句型；,Have,句型。,Be句型,这个信号太弱。,This is too weak a signal.,Be句型,这台仪器如此灵敏以至于它能测出压力的微弱变化。,This is so sensitive an instrument,that it can measure the slight change in pressure.,1.2 科技英语的特定结构及句型,It-that-,结构；,as,结构；,with,结构；,省略结构；,Be,句型；,Have,句型。,Have句型,这根管子(pipe)长约50米。,This pipe has an approximate length of 50 meters.,Have句型,X射线(X-rays)的波长(wavelength)比光线(light rays)短。,X-rays have a shorter wavelength than light rays.,Have句型,这种物质(substance)的化学结构比那种物质复杂(complicated)。,This substance has a more complicated chemical structure than that one.,Have句型,酒精(alcohol)的沸点(boiling point)没有水的沸点高。,(没有.高 not as high as),Alcohol does not have as high a boiling point as water.,Have句型,A triangle does not have as many sides as a polygon.,(没有多 not as many as),三角形的边没有多边形的多。,Have句型,The advantages of that type of antenna are simple structure and high efficiency.,那类天线的优点是结构简单、效率高。,That type of antenna has the advantages,of simple structure and high efficiency.,Have句型,The resistance of the external load is lower.,外部负载的电阻比较低。,The external load has a lower resistance.,Have句型,The property of the zero matrix is that A+0=A.,零矩阵的性质是A+0=A。,The zero matrix has the property that A+0=A.,Have句型,The frequency of its output waveform is exactly equal to one-half of the input.,其输出波形的频率精确地等于输入频率一半。,Its output waveform has a frequency exactly equal to one-half of the input.,Have句型,The moment,(力矩),of inertia of the usual moving-coil galvanometer,(电流计),is too large to follow the instantaneous values of an alternating current.),通常的动圈电流计的惯性矩太大了，以至于不能跟踪交流电的瞬时值。,The usual moving-coil galvanometer has too large a moment,(力矩),of inertia to follow the instantaneous values of an alternating current.,作业,阅读教材UNIT1,搜集专业术语,电子信息专业英语课程,第2讲 终,
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