真的很难想象，我们的世界会不会变成《黑客帝国》那样极端的纯虚拟生存。

It is very hard to imagine that if our world will become a place like "matrix" where we all live in a pure virtual world.

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由抽象类别衍生出来的类别必须实作纯虚拟成员函式，否则它们也是抽象类别。

Classes derived from the abstract class must implement the pure virtual member function or they, too, are abstract classes.

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针对传统陆上轮机模拟器的不足，研制了基于纯虚拟模拟的船舶轮机模拟训练系统(ME - STS)。

Aimed at the shortage of traditional Land-Based Marine engine Simulator (LBMES), Marine engine simulation training system (MESTS) is designed based on pure virtual simulation.

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