A class containing (or inheriting) one or more pure virtual functions is an abstract base class.
类包含或者继承一个或多个纯虚函数，这样的类就是抽象基类。
In a base class, abstract class is defined by declaring pure virtual function, a derived class must define all inherited pure virtual functions of its base classes to be concrete.
在基类中可以通过将虚函数声明为纯虚函数的手段来定义抽象类，强制派生类在自己的类定义中实现虚函数的具体功能。
Classes derived from the abstract class must implement the pure virtual member function or they, too, are abstract classes.
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。
Abstract : A class of nonlinear non-affine pure-feedback SISO systems with unknown nonlinear functions are investigated.
摘要：研究了一类非仿射的纯反馈单输入单输出非线性系统。
You could think of it as a "pure" abstract class.
咱们否将其设想替一个“杂”形象类。
You could think of it as a "pure" abstract class.
咱们否将其设想替一个“杂”形象类。
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