通过通道，事件可以从一个组件(事件产生者)流到另一个组件“事件处理者”。

Over a channel an event can flow from one component — the producer — to another one — the consumer.

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这些事件使用者能够在事件创建者之外的环境中处理事件。

These event consumers are able to process events outside the environment of the event creator.

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几乎所有组件都必须处理事件，要么作为事件的发布者，要么作为事件的处理者。

Nearly all components must deal with events, either as an event publisher or as an event handler.

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