有些数据（比如来自事务或其他消息传送系统的信息）可能已经使用了事件格式。
Some data, such as information from transactions, or some other messaging system, may already be in event format.
就像在gae或amazon的Elastic Beanstalk上托管一个web应用程序通常很合理一样，利用云消息传送系统也很合理。
Just as it often will make sense to host a web application on GAE or Amazon's Elastic Beanstalk, it also will make sense to leverage a cloud messaging system.
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