However, only one content handler can be associated with an events factory.
然而，仅有一个内容处理器可以与事件工厂相关联。
The notification occurs through the use of callbacks to the content handler.
并通过内容处理程序的回调进行通知。
The CBE is passed to the content handler automatically when the event is emitted.
发送事件时，CBE自动传送到内容处理程序。
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