In the later framework, MD5 is defined as an abstract class which can be extended, but its implementation is not trivial.
在Silverlight 2的框架中，MD 5被定义为抽象类，可对其进行扩展，但实现起来非常繁琐。
The UML to C++ transformation treats this as an abstract class, and generates code to reflect the same. For example, consider the following model
UML to C++转换的 UML将它看作一个抽象类，并且产生反映相同特性的代码。
Selects VC 6.0 as software development; tools, according to virtual instrument idea, each instrument category is designed as an abstract class.
以VC 6.0为软件开发工具，利用虚拟仪器的设计思想，将各类测试仪器设计成各个抽象类。
If an operation is declared as abstract then the inheriting class must provide a concrete implementation.
如果某项操作被宣布为抽象的那么继承的类必须提供了一个具体的实施方案。
You can declare standard and abstract methods in an abstract class, as shown in Listing 5.
可以在抽象类中声明标准和抽象方法，如清单5所示。
To handle this, you implement customers as an abstract base class with many different subclasses (for example, financial, manufacturing, and so on).
要处理这个问题，要把客户实现成一个抽象基类，拥有许多不同的子类（例如，财务、制造等等）。
Notice that an abstract class is denoted by italicized text, as are abstract methods.
注意，抽象类和抽象方法用斜体表示。
Suppose you have an abstract class Vehicle, defined as follows in Listing 5.
假设您有一个名为vehicle的抽象类，其定义如清单5所示。
In this case, we use an abstract class to define the service specification, as shown in Figure 5.
在这种情况下，我们使用一个抽象类来定义服务规范，如图5所示。
In this case, we use an abstract class to define the service interface and operations of the exposed capabilities, as shown in Figure 3.
在这种情况下，我们使用一个抽象的类，来定义服务接口以及预期功能的操作，如图3所示。
You can modify an existing class, pass it as a parameter, and take advantage of the API without requiring the base API to declare an abstract class or interface.
您可以修改已有类，将它作为参数传递，并利用API，而不需要基础 API声明一个抽象类或接口。
The customer class can be an abstract base class for a family of different customer types, such as private or business customer.
客户类可以是用于许多不同客户类型的抽象基类，比如说私有客户或业务客户。
An abstract class is good as well.
抽象类的方式也很好。
First, create an abstract base class that encapsulates this common functionality, as in Listing 7.
首先，创建一个抽象的基类，封装此通用功能，如清单7所示。
The class itself is also marked as abstract, allowing Tapestry to handle setting up an instance of the class and hook it into the Tapestry engine.
类本身被标记成抽象的，这允许Tapestry负责设置类的实例，并把实例挂接到 Tapestry 引擎。
And, as you may have noticed, we could have achieved the same effect as the code in Listings 1-3 by using an abstract class (abstract classes are described in Chapter 6).
而且，正如你可能注意到的，我们可以通过使用抽象类获得与清单1 - 3代码同样的效果(抽象类是在第6章中描述的)。
Component sits at the top of the hierarchy and ACTS as an abstract base class for all components. It provides various features such as.
Component位于层次结构的最顶端，充当所有组件的抽象基类。
Page acts as an abstract base class for all pages and can contain any arbitrary tree of Components.
Page充当所有页面的抽象基类并可包含 Component 的任意树。
Any class with an abstract method is automatically abstract itself, and must be declared as such. A class may be declared abstract even if it has no abstract methods.
任一类以一个抽象方法自动地是抽象的本身，且必须被声明，一个类可以被声明是抽象的既使它没有抽象方法。
Members marked as abstract, or included in an abstract class, must be implemented by classes that derive from the abstract class.
标记为抽象或包含在抽象类中的成员必须通过从抽象类派生的类来实现。
If the parent class is an abstract class and if it contains at least one abstract member, then all abstract members will be implemented as non-abstract inheriting classes.
如果父类是抽象类且至少包含一个抽象成员，则所有这些成员都将作为非抽象的继承类实现。
Its subclasses can override the method implementation as per need but the invocation is to be in the same way as defined by an abstract class.
它的子类可以按需要重写方法实现，但调用将以抽象类中定义的方式进行。
Its subclasses can override the method implementation as per need but the invocation is to be in the same way as defined by an abstract class.
它的子类可以按需要重写方法实现，但调用将以抽象类中定义的方式进行。
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