将这些逻辑抽象并隐藏在XmlHttpRequest服务中，当然要支持多个并发的请求。
And hide all this logic in a XmlHttpRequest service, of course, and support multiple concurrent requests.
抽象数据类型简称adt，是一种对数据的逻辑抽象，对他的操作方法无需关注具体的实现。
ADT, is a logical description of how we view the data and the operations that are allowed without regard to how they will be implemented.
实质蕴涵因其刻划真值函数关系故此并非传统逻辑表示充分条件关系的“若，则”的逻辑抽象。
Material implication, which describes a kind of truth value function, is naturally not the logic abstract of the sufficient condition relation.
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