这个代码的第一步是订阅外部事件。
The first step in this code is to subscribe to external events.
不过您也可以决定采取其他动作——比如触发外部事件。
But you could also decide to take other actions — trigger external events, for example.
它根据所接收的外部事件,从某个有效状态转移到另一个有效状态。
It moves from one valid state to another based on external events that it receives.
It becomes,in part,an external affair.
在某种程度上,它变成了外部事件。
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