Expires是RFC 2616（HTTP/1.0）协议中和网页缓存相关字段。用来控制缓存的失效日期，要注意的是，HTTP/1.0有一个功能比较弱的缓存控制机制：Pragma，使用HTTP/1.0的缓存将忽略Expires和Cache-Control头。
"My passports expired last month"
同义词： run out
同义词： die decease perish go exit pass away pass kick the bucket cash in one's chips buy the farm conk give-up the ghost drop dead pop off choke croak snuff it
同义词： exhale breathe out
以上来源于: WordNet
V-I When something such as a contract, deadline, or visa expires, it comes to an end or is no longer valid. 到期; 失效
He had lived illegally in the United States for five years after his visitor's visa expired.
访问签证到期后他在美国非法居住了5年。
Copyright expires seventy years after the death of the author.
版权在作者去世七十年后期满无效。
His term of appointment expires in August.
他8月份任职期满。
What if I need the money for an emergency before the deposit expires?
如果我在存款到期前急需这笔钱怎么办？
The United Nations climate change conference in Copenhagen is intended to create the framework to replace the Kyoto Protocol, which expires in 2012.
VOA: standard.2009.10.13
At the summit, the two sides agreed on the basic terms of a treaty to replace the START-One accord that expires in early December.
VOA: standard.2009.07.15
Kyoto expires in 2012. But many say a political framework is more likely at Copenhagen, with a binding accord to be worked out possibly next year.
VOA: standard.2009.12.08
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