主题是那些可以让我们个性化我们的网页浏览器，电子邮件客户端，音乐播放器和其它电脑程序的方式。
Themes are ways for us to customize the look of our web browser, e-mail client, music player, and other computer programs.
许多服务器和客户端邮件系统仅对“传入的”或者“新的”电子邮件进行归档，并且在电子邮件到达用户的邮箱之后便失去了作用。
Many server and client mail systems only file mail on "incoming" or "new" E-mail and become useless once the E-mail reaches the user's mailbox.
这些用户通常是私有IP网络环境中，客户端计算机已通过电子邮件和HTTP代理服务器直接接入公共互联网。
These users are typically on private IP networks where the client machines have indirectaccess to the public Internet via email and HTTP Proxies.
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