Computer English Unit 9 The Internet（计算机英语 第九单元 因(5)

This directory is implemented on a designated computer within the domain in the form of a server, called a name server, that responds to requests regarding address information.

这个目录在该域中充当服务器的一台指定计算机上实现。这个服务器叫做名称服务器，它对有关地址信息的请求作出响应。

Together, all the name servers throughout the Internet are part of an Internet-wide directory system known as the domain name system (DNS) that is used to convert addresses in mnemonic form into their equivalent bit-pattern forms.

整个因特网的所有名称服务器一起构成一个因特网范围的目录系统的一部分，该系统称为域名系统，用于将助记形式的地址转换成相应的位模式形式。

In particular, when a human requests that a message be sent to a destination identified in mnemonic form, DNS is used to convert that mnemonic address into its equivalent IP address that is compatible with the Internet software. 具体来说，当一个人请求将一份报文发送到以助记形

式标识的一个目的地时，域名系统被用于将该助记地址转换成与因特网软件兼容的相应IP地址。 The process of extracting information from DNS is often referred to as a “DNS lookup.” 从域名系统提取信息的过程常常被称为“域名系统查找”。

Normally, a DNS lookup is completed in a fraction of a second.

一般来说，完成一个域名系统查找只需要几分之一秒。