在人的思维活动中，虚概念作为真实概念的对立面存在，它弥补了真实概念的不足，是人们思维活动中不可缺少的。
In our thinking activities, suppositional concept exists as an antithesis of real concept. It makes up the insufficiency of real concept and reasonable answer to the thinking activities.
虚存系统中的一种外部存储器，其中包含以页面形式而存在的活动程序，在特定的时刻，只让系统去访问它所需要的指定页面。
In virtual storage systems, external storage that contains active programs in the form of pages and provides access only to the particular pages required by the system at a particular time.
虚存系统中的一种外部存储器，其中包含以页面形式而存在的活动程序，在特定的时刻，只让系统去访问它所需要的指定页面。
In virtual storage systems, external storage that contains active programs in the form of pages and provides access only to the particular pages required by the system at a particular time.
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