翻译 upgrading.po 过程中两个不明白的地方，请指教
"If you changed and recompiled a package locally, and didn't rename it or put "
"an epoch in the version, you must put it on hold to prevent it from being "
"upgraded."
an epoch in the version 是什么意思？
"Some users may have unofficial backported newer versions of packages that "
"<emphasis>are</emphasis> in Debian installed on their &oldreleasename; "
"system.
backported newer versions of packages 是什么意思？请翻译一下这一段，谢谢。
搞定这两处后，就可以提交上来请大家校对了。
如果您注意到了，不要惊讶。我就是认领 7-512 的那个人，虽然换了信箱。
--
Regards
Lei
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