Because HTTP is a stateless protocol, there is no inherent information about the page a user looked at previously before he or she looks at another one.
由于HTTP是无状态的协议，不存在有关用户在查看另一个页面之前所查看的页面的固有信息。
An album of previously unreleased songs is likely to hit stores before the end of this year, and another collection is due out later.
一张由以前未发行过的歌曲组成的专辑可能将在今年年底前上市销售，另一张合集计划稍后再进行发售。
At a recent presentation in New York, he says, he saw three firms he had previously seen less than a year before.
最近在纽约的一场演讲中，Alan Patric of说，不到一年之前他看的三家公司发生了巨大变化。
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