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1、第一节 词类介词1.of(1)“of+某些抽象名词”等效于这些名词相应的形容词，但语气更强。Engineers may find the book of value as a reference on basic problems.What is described in this section is of great importance.第一节 词类介词1.of(2)Of可表示“在之中”，既可用作最高级的比较范围，也可用在一般的句子中。Of all the computers in this laboratory,this one works best.Of all the four p
2、arameters,three can be disposed of rather quickly.第一节 词类介词1.of(3)Of可表示其前后两者处于同位关系The lighter machine part has a mass of 7 kg.This device can supply 4 mA of output drive current.第一节 词类介词1.of(4)其后面的名词是其前面的名词的逻辑主语Fig.2 shows the variation of the output with the input.Ellipses are used to describe the m
3、otions of the planets around the sun.第一节 词类介词1.of(5)其后面的名词是其前面的名词的逻辑宾语The resolution of a force into x-and y-components is possible.Exposure of the body to potentially toxic substances should be avoided.应避免使人体接触有潜在毒性的物质。第一节 词类介词1.with(1)“with+某些抽象名词”等效于这些名词所对应的副词，但语气更强These experiments should be don
4、e with care.This parameter can be measured with accuracy.(2)With与vary,change,increase,decrease等动词连用时可表示“随着”之意。The conductivity of a semiconductor varies with temperature.第一节 词类介词2.with(3)可构成一种“with结构”，其应用特别广泛With friction present,a part of power has been lost as heat.(4)将with 用在句首可表示“对了，有了”等意思With t
5、he alternating current,things are different.With radar,we can see distant objects.第一节 词类介词3.by(1)by可表示除了时间和距离外的任何参量的数值In this case v and i differ in phase by 90.(2)by可表示“根据，按照”，主要用在推导之中By Eq.(3),we can obtain the following expression.(3)“by+动名词”一般可表示“通过”之意By an examination of the performance of the
6、device,we can understand its features.By analyzing this model,one can learn about the structure of an atom.第一节 词类介词4.for(1)for 可表示时间或距离的长短The output may stay high for a long time.(2)for 可表示“对于，当时候，如果的话”For x1,this equation does not hold.This book is too difficult for a beginner.第一节 词类介词4.for(3)for 与
7、动词solve连用表示方程所要求解的对象It is necessary for us to solve this equation for x.(4)在method,technique,equation,algorithm,condition,requirement等词后多用for.There are several methods for antenna design.第一节 词类介词5.on和upon 在on和upon之后跟有动名词或表示动作的名词时，一般表示“一就”和“在之后”之意 On simplifying,the result becomes as follows.Upon rea
8、rranging the above equations,we get to the following set of equations.第一节 词类介词6.in(1)in后跟表示单位的名词复数时,意为“用”Here t is measured in seconds.(2)in后跟表示方向的词时，意为“朝”Radio waves travel in all directions.(3)in可表示“方面”This computer is good in quality.第一节 词类介词6.in(4)in后跟动名词或表示动作的名词时,意为“在时候”、“在过程中”In our discussion of differential equations,we shall restrict our attention to equations of the first degree.(5)在名词reduction,decrease,increase,change,drop,rise,fall等后多用in We can measure the slight change in pressure.