When a feed reader accesses an Atom feed or entry that has expired, it should alert the user in some way.
当feed阅读器访问一个已经过期的Atom feed或条目时，它会以某种方式向用户发出警告。
When a feed reader accesses an Atom feed or entry that has expired, it should alert the user in some way.
当feed阅读器访问一个已经过期的Atom feed或条目时，它会以某种方式向用户发出警告。
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