A domain can be a single organizational unit or an entire industry.
域可以是一个组织单元，也可以是整个企业。
Normally you would use a single zone file for a forward domain.
一个转发域一般使用单个区域文件。
Every single website operator must have a domain name to function.
每一个网站的运行者必须有一个域名才能运作。
Every single website operator must have a domain name to function.
每一个网站的运行者必须有一个域名才能运作。
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