A good example of this would be a user using the application, taking a lunch break, and returning to the application after the authentication key had expired.

这方面的一个很好的例子是用户正在运行应用程序，午饭过后，当他返回到应用程序时，认证密钥已经过期了。

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EXPIRED: Indicates the key has outgrown its pre-defined lifetime.

EXPIRED：表示密钥已经超过了预定义的生存期。

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The item is expired — Individual items can have an expiration to allow them to be flushed from the cache when the information stored against the key is likely to be too old.

条目过期失效 — 各条目均有一个有效的期限以便针对此键存储的信息在过于陈旧时可从缓存中清除这些条目。

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