E-mail中@的意思

That little "a" with a circle curling around it that is found in email addresses is most commonly referred to as the "at" symbol.　　
小写字母“a”外加个圆圈，这一符号常出现在email（电子邮件）地址中，通常是作为“at”（在）的标记。

　　Surprisingly though, there is no official, universal name for this sign. There are dozens of strange terms to describe the @ symbol.
　　然而令人感到惊奇的是，这一标记居然没有官方的，通用的名称。有几十个奇怪的术语用来描绘@这一符号。

　　Before it became the standard symbol for electronic mail, the @ symbol was used to represent the cost or weight of something. For instance, if you purchased 6 apples, you might write it as 6 apples @ $1.10 each.
　　@这一符号在成为电子邮件的标准符号之前，曾被用来表示物品的单价或质量。例如，你买6只苹果。就可以写成：六只苹果，每只@$1.10，表示每只苹果1.10美元。

　　With the introduction of e-mail came the popularity of the @ symbol. The @ symbol or the "at sign" separates a person's online user name from his mail server address. For instance, jichunying001@163.com. Its widespread use on the Internet made it necessary to put this symbol on keyboards in other countries that have never seen or used the symbol before. As a result, there is really no official name for this symbol.
　　随着电子邮件的使用，@这一符号越来越普及了。符号@或“at”标记将上网用户的姓名与其邮件的服务器地址分开。例如:jichunying001@163.com.。 这一符号在因特网上的广泛使用使得许多以前从未见过或使用过它的国家必须在它们的电脑键盘上加上这一符号键，结果造成这一符号并没有真正的官方名称。

　　The actual origin of the @ symbol remains an enigma.
　　@符号的确切起源仍然是谜。