event class的用法和样例：
例句
- Class based on the given query string or event class name.
基于给定的查询字符串或事件类名初始化。 - Each event rule must be associated with a single event class.
每个事件规则都必须与单个事件类关联。
event class的相关资料：
临近单词
eventer
event
Event loop with command-line switches
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event-related potentials in lie detection
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Event-based Asynchronous Pattern Technology Sample
