计算机专业英语（第2版）Chapter 2 Computer Network.ppt

计算机专业英语 (第2版) 北京大学出版社 Chapter 2 Computer Network 2.1 Introduction to Computer Network 2.2 Data Communications Channels 2.3 Main Factors Affecting Data Transmission 2.4 Network Architecture 2.1 Introduction to Computer Network alternatively adv. 二中择一地，换句话说 attach v. 附上，连接 audit v. 审计，会计检查，查账 augment v. 增大；增加 backbone n. 构架，中心，中枢，主 cafeteria n. 自助食堂 candidate n. 选择物，候选人 clumsy adj. 笨拙的 engagement n. 约定 exchange v. 交换，调换 2.1 Introduction to Computer Network Computer network is a system connecting two or more computers. A computer network allows user to exchange data quickly, access and share resources including equipments, application software, and information. 计算机网络是连接两个或多个计算机的系统，它允许用户快速地交换数据，访问和共享包括设备、应用软件和信息在内的资源。 2.2 Data Communications Channels Antenna n. 天线 axis n. 轴心，中轴 baseband n. 基带 boost v. 增加，放大 cable n. 电缆 Charge n. 电荷 cladding n. 金属包层，外罩 coaxial adj. 同轴的，共轴的 configuration n. 配置，结构，布局，格局 curvature n. 弯曲，曲度，弧度 2.2 Data Communications Channels To get here to there, data must move through something. A telephone line, cable, or the atmosphere are all transmission media or channels. But before the data can be communicated, it must be converted into a form suitable for communication. 数据为了传递，必须通过一些东西：电话线、电缆或空气都是传输介质，即信道。但是，数据在传送前必须被转化成适于通信的形式。 2.3 Main Factors Affecting Data Transmission adhere v. 粘着于（坚持，追随）…… assume v. 假定，设想，采取，呈现 asynchronous adj. 异步的 broadband n. 宽频带，宽波段 bulletin n. 公报，通报，告示 duplex adj. 双工的，双向的 2.3 Main Factors Affecting Data Transmission There are several factors that affect data transmission. They include speed or bandwidth, serial or parallel transmission, direction of data flow, modes of transmission data, and protocols. 有几个影响数据传送的因素，包括速度或带宽、串行或并行传送、数据流的方向、数据传送