当你已经确定应用程序的哪些事件用户可能会关心之后，如果有的话，你也应该允许你的用户决定哪些事件使用什么类型的通知。
After you've identified the events your users are likely to care about, you should also allow users to decide which events should generate what type of notification, if any.
添加事件时，用户需要填写标题、类别、开始时间和持续时间字段。
When adding an event, the user is required to type in the title, category, start time and duration fields.
通知客户机实际的事件：用户按下某个按键；午夜时钟敲响；风扇停止工作造成 CPU 烧毁；
To Notify Clients About Real-World Events The user pressed a key; the clock struck midnight; the fan failed and the CPU is on fire.
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