Upward skip-level messaging always cascade from child bus to parent bus.
向上的跨级消息传递总是由子级总线依次传递给父级总线。
Downward skip-level messaging always cascade from parent bus to child bus.
向下的跨级消息传递总是由父级总线依次传递给子级总线。
Downward skip-level messaging always cascade from parent bus to child bus.
向下的跨级消息传递总是由父级总线依次传递给子级总线。
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