As notification of state changes are received at an observer (at the arrowhead), the observer, acting as an observable, can decide which of its own observers it will notify further.
一个观察者对象接收到了状态更改的通知(箭头所指的方向)，然后，该观察者本身也作为被观察目标，它然后决定在下一步通知哪些它自身的观察者。
As notification of state changes are received at an observer (at the arrowhead), the observer, acting as an observable, can decide which of its own observers it will notify further.
一个观察者对象接收到了状态更改的通知(箭头所指的方向)，然后，该观察者本身也作为被观察目标，它然后决定在下一步通知哪些它自身的观察者。
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