Then, there are lower level domains that sit below that, called second level domains; Examples under .com include google.com and dftba.com.
然后，还有位于其下方的较低级别的域，称为二级域； .com 下的示例包括 google.com 和 dftba.com。
| 单词 | Second level domain |
| 释义 |
Second level domain
原声例句
科技 Crash Course Then, there are lower level domains that sit below that, called second level domains; Examples under .com include google.com and dftba.com. 然后，还有位于其下方的较低级别的域，称为二级域； .com 下的示例包括 google.com 和 dftba.com。 科技 Crash Course Like I said, more than 300 million domain names, and that's just second level domain names, not all the sub domains. 就像我说的，超过 3 亿个域名，这只是二级域名，而不是所有的子域。
中文百科
二级域 Second-level domain（重定向自Second level domain）
二级域（或二级域名；英语：Second-level domain；英文缩写：SLD）是互联网DNS等级之中，处于顶级域名之下的域。二级域名是域名的倒数第二个部份，例如在example.com这个域名中，二级域名是example。
英语百科
Second-level domain 二级域（重定向自Second level domain）
In the Domain Name System (DNS) hierarchy, a second-level domain (SLD) is a domain that is directly below a top-level domain (TLD). For example, in example.com, example is the second-level domain of the .com TLD. Second-level domains commonly refer to the organization that registered the domain name with a domain name registrar. Some domain name registries introduce a second-level hierarchy to a TLD that indicates the type of entity intended to register an SLD under it. For example, in the .uk namespace a college or other academic institution would register under the .ac.uk ccSLD, while companies would register under .co.uk. |
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