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.
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