END和ERROR事件代表着连接结束或出现了错误。
The end and error events represent the end of the connection or the occurrence of an error.
每个事件代表状态中的一个变化，所有普通实体状态的有序和代表了一个生命周期。
Each event represents a change in state, and the ordered sum of all normal entity states represents a lifecycle.
表的行和列代表事件和状态，单元格内包含动作和转移。
Rows and columns represent events and states, and cells contain actions and transitions.
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