表示在以用户模式执行应用程序期间发生的事件。
The means that the event happens during applications executing in user mode.
对于每个实体，一个通用模式会出现——用户执行一次搜索，选择一个实体，查看详细信息页面，然后CRUD该实体。
For each entity, a common pattern emerges — users perform a search, select an entity, view a detail page, and CRUD the entity.
Ajax设计模式极为适合用户，因为他们执行每个活动时，都会接收到直接响应。
The Ajax design pattern is good for users because they receive a direct response to each action they perform.
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