信息和通信工程专业英语01.pptVIP

信息与通信工程专业英语;第1篇 科技书籍常用语法;（一）It作为形式主语的主语从句 ;2．It is said that… 据说…… 例：It is said that an asynchronous data link is character-oriented. 3．It has been found that… 人们已经发现…… It has been found that noise can be introduced into transmission path in many different ways.;（二）强调句型;例2．It was we who did an experiment on the speed of sound yesterday. 2．对于谓语动词的强调 例1．PSTN did play an important role in communication industry in the past few decades. ;3．倒装语序的强调 例1．Astounding as these advances may seem, we are only at the beginning of what is possible. 例2．Each network is only capable of transporting one specific service for which it was intentionally designed. Only in a limited number of cases can it be adapted to other services.;（三）动词不定式;2．不定式动词短语作宾语 例1．As a system analyst, you will be expected to learn the jargon used by computer salespeople and judge the validity of their sales claims 例2．As a user, you have understood how to use the computer effectively. ;3．不定式动词短语作表语 例1．As a system manager, your job is to maximize the efficiency of your systems. 例2．The original idea of ARPANET was to increase computing capacity that could be shared by users in many locations and to find out what would happen for computer networks to survive a nuclear war or other disaster.;4．不定式动词短语作定语 例1．The simplest way to access a file on any Internet machine is to copy it across the net work to your local machine.（在Internet上访问一个文件最简单的办法就是把这个文件复制到你自己的机器上。）此处的动词不定式to access是用来修饰先行词way的。 例2．Are you sure there is a real need to replace the older equipment?（你确定要把这台老设备换掉吗？）to replace 在这里修饰名词need。;5．不定式动词短语作状语 例1．If you have a better understanding of a computer, you will be able to write better programs. 例2．Advanced network management and maintenance capabilities are required to (effectively) manage the flexibility provided by SDH;6．复合宾语 动词不定式复合宾语= ① 名词（宾语）+ 不定式动词短语 ② 宾格代词（宾语）+ 不定式动词短语 ③ 宾格代词（宾语）+ 形容词+不定式动词短语 例1．The students asked the teacher to explain the difficult theory again. 例2．Email permits netw