Publish-and-subscribe messaging is a way to achieve one-to-many delivery semantics between applications for a given message as shown in figure 2.
发布-订阅消息传递是针对一条特定消息在应用程序间实现一对多传递语义的消息传递方式，如图2所示。
And instant messaging software also play an increasingly important role in our lives, in many occasions are to be used, for example, each of our students have at least one QQ number.
而即时通讯软件，在我们的生活中也扮演着一个日益重要的角色，在许多场合中都会使用到，比方我们每个同学都有至少一个QQ号。
And instant messaging software also play an increasingly important role in our lives, in many occasions are to be used, for example, each of our students have at least one QQ number.
而即时通讯软件，在我们的生活中也扮演着一个日益重要的角色，在许多场合中都会使用到，比方我们每个同学都有至少一个QQ号。
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