无耦合的关联：事件发布者和事件订阅者预先无需知道彼此的存在。

Decoupled associations: event publishers and event subscribers don't need to know the existence of each other beforehand.

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此类订阅机制应该允许指定所关心的事件类型，从而防止订阅者被通知所“淹没”。

Such a subscription mechanism should allow specifying the types of events that are of interest, thus preventing the subscriber from being flooded with notifications.

youdao

相同事件可被多个订阅者接收。

The same event may be received by multiple subscribers.

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