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The composite event is pooled, which means that the composite event object will be reused and all attributes will be valued to null after being called. This mechanism is used for performance optimization, so you cannot access the event asynchronously. Unless called, the method will not put the event into the event pool, keeping the event object not referenced by the reset allow code.User class unified interface, User1 and User2 are different objects respectively, and they are related. If the mediator mode is not adopted, the two need to hold references to each other, so the coupling degree between the two is very high. In order to decouple, the Mediator class is introduced to provide unified interface, and MyMediator is its implementation class, which holds instances of User1 and User2 to control User1 and User2. In this way, User1 and User2 objects are independent of each other. They only need to maintain a good relationship with the Mediator, and the rest is maintained by the MyMediator class! Basic implementation:官方这次所公开的资讯中，除了可看见蓝泽薄荷、碧川莴苣、黄步铃、藤原石榴的战斗服姿态外，在概念宣传影片中除了可听见主演声优们的声音外，背景音乐也是采用了由她们组成的团体“Smewthie”演唱的“bitter sweet darling”一曲。Rename Import Variable