We can't instantiate instances of abstract classes, even when all their field and method members are concrete.
我们不能实例化一个抽象类，即使它们的字段和方法都是具体的。
Client classes can be coded to require only the abstract type, leaving the strategies and outcomes of implementation to the concrete class instances passed to them at run time.
客户机类可被编码为只需要抽象类型，而把实现策略和结果留给在运行时传递给它们的具体类实例。
Another helpful addition to PHP V5 is the abstract class, which makes it easy to have one base class to implement the core of an interface from which you then create concrete classes.
PHPV 5中另一个有帮助的新功能是抽象类，使用抽象类可以轻松地用一个基类实现接口的核心部分，然后用该接口创建实体类。
When referring to the classes Open Close Principle can be ensured by use of Abstract classes and concrete classes for implementing their behavior.
当提及类的打开关闭原则，它可以通过抽象类和实体类实现行为的方式来确保。
Its components rely on interfaces and abstract classes as opposed to concrete ones, as they would in a tightly coupled system.
松散耦合应用程序中的组件依赖于各种接口和抽象类，而紧密耦合的系统则与之相反，其组件依赖于各种具体的类。
By further examining the exception package and noting the ratio of abstract to concrete classes, you can derive another metric: abstractness.
通过进一步检查exception包并注意抽象到具体类的比率，可以派生出另一个度量：抽象性。
These are abstract classes and have concrete implementations in the form of One2One and Any2One type channels.
这些都是抽象类，它们拥有one2one和Any2One类型通道形式的具体实现。
So, if you inherit the abstract class in multiple concrete classes, then the properties of the abstract class will be part of each table of the concrete class.
因此如果你在多个具体的类中，继承了抽象类的话，那么这个抽象类的属性将会是每一个具体的类(表)的属性的一部分。
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。
There are no base classes to extend from, the classes are concrete (not abstract), and there's no XML file.
不在需要继承基类。类就是具体的类(没有抽象)也没有XML文件。
Capture highlevel, stable concepts in abstract classes and interfaces and provide implementations using concrete classes.
在抽象的类和接口中捕捉高级、稳定的概念，并用具象类实现。
Capture highlevel, stable concepts in abstract classes and interfaces and provide implementations using concrete classes.
在抽象的类和接口中捕捉高级、稳定的概念，并用具象类实现。
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