Education: Test Drive a Self-Paced Virtual Class at No charge.

教育：免费体验一个自学虚拟课程。

And once a virtual class is finished, it can be reused in an on-demand fashion.

而且一旦完成了一个虚拟的课程，它可以再使用到单需求的版本中。

A virtual class or function is code that the application will eventually need, but it isn't written yet.

所谓虚类或虚函数是指应用程序以后需要，但是目前还没写的代码。

Through analysis, we can conclude that the origin of internet based education is a virtual class, not only in terms of technology, educational aim, but.

文章从传统教学模式出发，结合网络技术，提出一种虚拟课堂系统，使得传统教学模式向网络教学模式的过渡变得极其平缓。

By its subclassing from this restriction, the RelevantResource class is a sort of virtual class that includes a set of all resources that meet the restriction.

通过从这一约束条件划分子类， RelevantResource 类成为一种包含一个所有满足该约束条件资源集合的虚拟类。