官方认为飞机比预定事件晚起飞一个小时，因为天气条件太恶劣而坠毁。
The official said the plane had taken off an hour later than scheduled, and came down because of bad weather conditions.
这些规则通常将对某个时间段内的消息按照类型和条件进行筛选，然后根据各种预定义模式检测各种状况。
These rules typically filter messages by type and condition within some time window and then detect situations according to various predefined patterns.
系统提供了预定义的简单条件，还允许定义定制的条件。
Simple predefined conditions as well as the ability to define a custom condition are provided.
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