unit 4.ppt

1、计算机英语,人民邮电出版社,21世纪高等学校计算机规划教材,司爱侠 张强华 编著,Unit 4 Operating System,退出,New Words,New Words,New Words,New Words,Phrases,video card视频卡 sound card声卡 along with 连同.一起, 随同.一起 break into攻入，破门而入, 侵占 a member of许多 come out 出现 lie in存在于,Phrases,be plagued with被.折磨；被.烦扰；苦恼 look for寻找, 期待 be around for出现，存在 gain

2、illegal access to非法访问,Abbreviations,CD 光盘(Compact Disc),Text,请老师朗读并讲解课文,Notes,1 It translates commands from the operating system or user into commands understood by the component part it interfaces with. 本句中，from the operating system or user是一个介词短语，作定语，修饰和限定它前面的commands 。understood by the component

3、part it interfaces with是一个过去分词短语，作定语，修饰和限定它前面的commands。在该过去分词短语中，it interfaces with是一个定语从句，修饰和限定the component part。translates into 的意思是“把翻译成”。,Notes,2 The operating system makes these interfacing functions along with its other functions operate smoothly and these functions are mostly transparent to

4、the user. 本句中，The operating system作主语，makes作谓语，these interfacing functions along with its other functions作宾语，operate smoothly是一个不带to的动词不定史短语，作宾语补足语。 英语中，当make、let、have、see、hear、watch、notice、feel等动词后面用不定式作宾语补足语时，不定式都不带to。这一点特别重要。,Notes,3 These can happen due to a software bug typically in the operati

5、ng system, although computer programs being run on the operating system can make the system more unstable or may even crash the system by themselves. 本句中，due to a software bug typically in the operating system 是一个原因状语。due to 的意思是“由于，因为”。although computer programs being run on the operating system ca

6、n make the system more unstable or may even crash the system by themselves是一个让步状语从句。在该从句中，computer programs作主语，being run on the operating system作定语，修饰computer programs，can make作谓语，the system作宾语，more unstable作宾语补足语，or是连词，连接并列谓语，意思是“或者”。,Notes,4 The greatest problem with these operating systems lies i

7、n the fact that not as many application programs are written for them. 本句中，that not as many application programs are written for them是一个同位语从句，作the fact的同位语，说明其内容。 英语中，同位语用来对一个词或词组的内容加以说明。它通常位于与之同位的词或词组之后。 另外, lie in的意思是“存在于”。,Notes,5 It is primary used to be a server rather than a workstation and should not be used by anyone who does not understand the system. 本句中，It指Unix。who does not understand the