When multiple observers are present, use the bubbling phase if you want closer observers to fire first.
当存在多个观测者时，如果希望首先触发最近的观测者则使用冒泡阶段。
We could hear the pot bubbling quietly on the fire.
我们听到水壶在火上发出单调的沸腾声。
We could hear the pot bubbling quietly on the fire.
我们听得见炉火上的水壶在轻轻地发出噗噗声。
We could hear the pot bubbling quietly on the fire.
我们听得见炉火上的水壶在轻轻地发出噗噗声。
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