unit 2 Internet and Protocols.pptVIP

Unit 2  Internet and Protocols 1. Computer networks and the Internet, which connects computer networks around the world to each other, form the basic technology structure that underlies all electronic underlie 动词进行时： underlying 过去式： underlay 过去分词： underlain; 支承，构成（理论等）的基础 （1） However, the underlying principle behind Intranet theory is information democracy. 然而，内部网理论背后的基本原理是“信息民主”。 （2）Networks are the underlying infrastructure that is used by the wireless carriers. 网络是无线载波使用的底层基础设施。 （3）Netscape is trying to further diminish the role of the underlying operating system, which is usually Windows. 网景现正设法进一步削弱基础操作系统（通常是windows）的作用。 2. The Internet is a large system of interconnected computer networks that spans the globe. span : to cover or extend over an area or time period 持续；延伸, 横越 The parking lot spans 3 acres 停车场延伸3英亩 The novel spans three centuries 该小说的跨度达3个世纪。 The globe = the earth 3. It had its origins as a military project back in 1969. 它的起源可以追溯到1969年的一个军事项目 4. it became the engine that is to propel the world into the information age … propel： cause to move forward with force 驱动 Steam propels this ship 蒸汽驱动轮船 This is a mechanically propelled vehicle.这是一台机械力推动的车辆。 5. It is unlike the railway, …of the past that were owned by large private corporations or state monopolies. monopoly: [ m?‘n?p?li ] n. 垄断,专利 He seems to think he has a monopoly of brains.? 他似乎认为只有他才聪明。 The telecommunication service is a government monopoly.? 电信为政府专营。 6. It is a pattern of usage of information and communications technologies that transcends … transcend v. 超越 go beyond She far transcends the others in beauty and intelligence.?她才貌出众。 There are Emotions that transcend understanding. 有一些情感它无法理解 7 . The individuals, institutions and companies that make information available, … available （1）. It is a common way to make