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。
Residual data occurs when instance resources previously allocated are not purged completely of the data before they are re-allocated to the same or different user.
如果以前分配的实例资源在没有完全清除数据的情况下重新分配给相同或不同的用户，就会出现残留的数据。
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