邮箱是什么 怎么写才正确 QQ号能当邮箱用吗,邮箱使用指南,正确写法与QQ号作为邮箱的适用性
What is an email address and how to write it correctly? Can a QQ number be used as an email address? Email usage guide, correct writing method and the applicability of a QQ number as an email address
以上为机器翻译结果，长、整句建议使用 人工翻译 。