计算机专业英语（第二版）孙建忠电子教案 Chapter8.pptVIP

Computer English Chapter 8 The Internet 英语长句的翻译 英语长句的翻译 英语长句的翻译 英语长句的翻译 英语长句的翻译 英语长句的翻译 英语长句的翻译 With the development of personal computers and local area networks during the late 1970s and early 1980s, client/server computing became possible. Client/server computing has many advantages over centralized mainframe computing. For instance, it is easy to expand capacity by adding servers and clients. Also, client/ server networks are less vulnerable than centralized computing architectures. 20世纪70年代后期和80年代初期，随着个人计算机和局域网的发展，客户机/服务器计算技术成为可能。客户机/服务器计算技术比中央大型机计算有许多优势。比如，通过增加服务器和客户机，可很容易地扩容。同时，客户机/服务器网络比中央计算结构不易受损。 8.1 The Internet: Key Technology Concepts If one server goes down, backup or mirror servers can pick up the slack; if a client machine is inoperable, the rest of the network continues operating. Moreover, processing load is balanced over many powerful smaller machines rather than being concentrated in a single huge machine that performs processing for everyone. Both software and hardware in client/server environments can be built more simply and economically. 如果一个服务器被破坏，备用的或镜像服务器能恢复工作；如果一部客户机不能运转，网络的其部分可继续运行。而且, 负荷处理通过许多强大的、较小的机器达到平衡，而不是集中于一部为每个人进行处理的巨型机。在客户机/服务器环境中，建立软件与硬件都更简单、更经济。 8.1 The Internet: Key Technology Concepts New Words Expressions Telnet 远程登录 Finger 查找器(查找因特网用户的程序) Ping 测试IP地址的程序 Tracert 检查路由器程序 8.2 Other Internet Protocols And Utility Programs Abbreviations FTP (File Transfer Protocol) 文件传输协议 POP (Post Office Protocol)邮局协议 SSL (Security Socket Layer) 加密套接字协议层 RAM (random access memory) 随机存储器 SMTP (Simple Message Transfer Protocol)简单邮件传输协议, 用于电子邮件的传输 IMAP (Internet Message Access Protocol) Internet消息访问协议 There are many other Internet protocols that provide services to users in the form of Internet applications that run on Internet clients and servers. These Internet services are based on universally accepted protocols—or standards—that are available to everyone who uses the Internet. They are not owned by any one organization but are