最好的习惯是始终使用它自己的组织域名来确保命名空间唯一。
The best practice is to always make the namespace unique by qualifying it with its own organization domain name.
域名系统中的地址组织为树形结构。
Addresses within the domain name system are organized in a tree structure.
任何时候应该不会有多个人或组织同时拥有给定的域名或电子邮件地址。
Presumably, not more than one person or organization owns any given domain name or E-mail address on any given day.
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