其他版本(更新版本和更旧版本)也可以运行，但它所需的各类文件的位置会发生改变。
Other versions (newer and older) may work, but the location of the required class file within it may have changed.
它应用邮件处理代理(例如一个POP服务器)来区别旧版本和新版本所生成的邮件消息。
It allows mail-processing agents (such as a POP server) to distinguish between mail messages that are generated by older versions and new versions.
我们还将创建一个新命名空间来承载此类型，以避免与现有定义冲突，消除Address的旧版本和新版本间的混淆。
We also create a new namespace for this type to exist in, so it does not clash with the existing definition and there will be no confusion between the old and new version of Address.
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