Class to notify the user of events that happen.

这是一个用来通知手机使用者有事件发生的类。

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The user can define his own game logic events, too.

用户也可以定义自己的游戏逻辑事件。

youdao

The user can define his own game logic events, too.

用户也可以定义自己的游戏逻辑事件。

youdao