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长轮询是一种轮询技术，其中服务器延迟完成HTTP请求，直至已经为客户机准备好了一个更新信息或发生超时。
Long polling is a polling technique in which the server will delay completing the HTTP response until either an update is ready for the client or a timeout occurs.
设想一个情景，一个架构师或开发人员已经致力于一个应用程序相当长的时间了，因此他或她的脑子里有许多这类的信息。
Imagine a situation where an architect or developer has been working on an application for quite a long time, and therefore has a lot of this kind of information stored in his or her head.
只要为此程序或任何别的程序没有未决定的信息长的工作将继续运行。
The long job will continue running as long as there are no pending messages for the program or any other program.
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