通常，当缓存单独页面时，需要用清理器使之过期失效。
Normally, when you cache individual pages, you need to expire them with sweepers.
为确保抢救药品质量，避免过期失效，对抢救药品有效期的检查方法进行改进；
In order to ensure the quality of emergency drugs and avoid the overdue drugs, we improved the check method of valid date for emergency drugs.
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。
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.
二战时血液制品的储备在1950年底，很多已经过期失效，有一些可以被再加工，其成本是约新产品的三分之一。
The reserves of blood derivatives left from World War II will largely be outdated by the end of 1950, though some can be reprocessed, at about a third of the cost of new products.
然后，令牌将过期或失效(如果可能)。
The token then either expires or gets invalidated (if possible).
第二，缓存支持可以强制失效的过期依赖项。
Secondly, the Cache supports expiration dependencies that can force invalidation.
可以通过在部署描述符中指定过期实现片断缓存的失效。
The invalidation of the fragment cache can be accomplished by specifying the expiration time in the deployment descriptor.
WebSpherePortal为远程缓存所使用的唯一失效机制是过期超时。
The only invalidation mechanism that WebSphere Portal USES for remote caches is expiration timeout.
sessionDestroyed——在会话失效或过期之后，容器调用这个方法。
SessionDestroyed - The container calls this method after a session is invalidated or expired.
很可能通过一个过期时间来界定生存期，特别是在分布式环境中，要使一个令牌失效是非常困难的。
The lifetime is most likely bounded by an expiration time, especially in a distributed environment where invalidating a token can be quite a challenge.
使用统计、最新消息、过期消息、自动应答、失效链接检查和搜索引擎是站长们应该利用的一些工具。
Usagestatistics, what's new, what's old (Tours, outline), autoresponders, bad URLcheckers, and search engines are some of the tools webmasters should utilize.
为了确保不会显示已过期的标记，容器将使Portlet(窗口)的所有导航状态的缓存项全部失效。
To make sure a stale markup is not displayed, the container invalidates the cache entries for all navigational states of the portlet (window).
基于时间的缓存过期插件：Richard Livsey的一款插件，可用来处理基于时间的缓存分段到期失效。
Timed-cache expiration plug-in: Richard Livsey's plug-in to handle timed expiration of cache fragments.
2015年，约有90%的苹果期权失效过期。
Approximately 90% of all Appleoptions expired worthless in 2015.
2015年，约有90%的苹果期权失效过期。
Approximately 90% of all Appleoptions expired worthless in 2015.
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