电子邮件地址中 @ 字符之前的字符串是否有术语？
描述 URL 时，URL 的每个部分都有明确定义的术语，例如协议、主机名、路径和查询。
描述电子邮件地址时，@ 字符后面的部分是域名。 @ 字符之前的部分是否有一个普遍接受的术语？
When describing a URL, there are well-defined terms for each part of the URL, like protocol, hostname, path and query.
When describing an email address, the part after the @ character is the domain. Is there a universally accepted term for the part before the @ character?
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我通常将其称为邮箱或用户名。我不知道日常语言中使用的单个规范描述符，但我不太谈论电子邮件地址的部分。
也许最正确的正式名称是“local-part”，如 rfc 中所引用：
https://www.rfc-editor.org/rfc/rfc5321#section-2.3.11
I'd generally refer to it as the mailbox, or the username. I'm not aware of a single canonical descriptor that is used in daily language, but I don't talk about the parts of email addresses much.
Probably the most correct formal name for it is the "local-part", as referenced in the rfc:
https://www.rfc-editor.org/rfc/rfc5321#section-2.3.11
我也听说过使用“茎”一词，但可能会将其与其他一些术语混淆。
I've also heard the term "stem" used, but might be confusing that with some other terminology.