顶级域名：是指域名体系中根节点下的第一级域的名称。
Top-level domain (TLD) refers to the name of the first level domain under the root node in the domain name system.
与根域名服务器等顶级域相比，本地的权威名字服务器更易于发生设备故障和遭受恶意攻击。
Comparing with the top-level domains (TLD) such as the root servers, the local authoritative servers were more vulnerable to device failures and malicious attacks.
“搜索以下网站或网域”可以让你通过输入一个顶级域名(如。co .uk)来限定搜索结果。
Advanced Search lets you type in a Top Level domain (like.co.uk) in the "Search within site of domain" box to restrict results.
该名称服务器检查其数据库和缓存，没有找到任何结果，于是向 .com顶级域的根服务器发送一个迭代请求。
The name server checks its database and cache, doesn't find anything, and sends an iterative request to a root server for the .com top-level domain.
指导创建和管理顶级域名（或者称之为TLDs）的规则，例如dot.com dot.org 以及基于国家的TLDs，像英国的dot.UK，澳大利亚的dot.AU 以及其他180或者更多的其他任意一个国家的域。
UK for the United Kingdom, or dot. AU for Australia, and any of a number of a 180 or more other country domains.
很显然，程序末尾仅少了个句号使得域名系统(DNS)无法识别“。se”了，“。se”是瑞典的“顶级”(国家)域。
Apparently a single missing full stop at the end of the code meant that the domain Name Systems (DNS) failed to recognise.se as the "top-level" (country-wide) domain.
很显然，程序末尾仅少了个句号使得域名系统(DNS)无法识别“。se”了，“。se”是瑞典的“顶级”(国家)域。
Apparently a single missing full stop at the end of the code meant that the domain Name Systems (DNS) failed to recognise.se as the "top-level" (country-wide) domain.
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