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域名，是企业或机构在因特网上留下的网络地址，谁如果想让别人在因特网上找到自己，就必须拥有与自己的英文名称相一致的城名。有了这个城名，人们只要把它键入网络电脑，这个单位的信息就可调出，一览无余。但由于域名来自英文26个字母的不同排列组合，因而其数量总是有限的?
A domain name is the network address that an enterprise or organization leaves on the Internet and whoever wants others to find themselves on the Internet must have a city name that is consistent with their English name. With this city name, people simply type it into the network computer, the information of this unit can be transferred out, glance. However, since the domain names come from different combinations of 26 letters in English, their quantity is always limited?