The main function shows the standard sequence for sending the message and handling the events.
主函数中给出了用于发送消息和处理事件的标准序列。
Using the UML extension mechanism, the standard sequence diagram is extended.
运用UML扩展机制，对标准的顺序图进行了扩充。
Using the UML extension mechanism, the standard sequence diagram is extended.
运用UML扩展机制，对标准的顺序图进行了扩充。
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