An essential use case model, often referred to as a business or abstract use case model, models a technology-independent view of your behavioral requirements.
基本用例模型，通常称为商业或抽象用例模型，对行为需求的与技术无关的视图建模。
There are two concrete use cases: Ticket Payment by Internet and Ticket Payment by Phone. These use cases are variations of the abstract use case called just Ticket Payment.
有两种具体的用例：通过因特网支付票费及通过电话支付票费，这些用例是所谓票额支付抽象用例的变种。
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。
The fact the AMQP is an abstract protocol (in the sense that it does not address one specific use case) does not make things much more complicated.
AMQP是一个抽象的协议（也就是说它不负责处理具体的数据），这个事实并不会将事情变得更复杂。
The use case specification itself is abstract or generic, in the sense that you don't expect different flows for different search terms.
用例配置本身是抽象的或者通用的，在这个意义上您不要对不同的搜索项期待不同的流程。
If your child classes have the common functionality then why you will override the method in every class? You can use the base class (which is abstract in this case) method.
如果你的孩子班的通用功能，那你为什么会覆盖在每一个类的方法？您可以使用基类(本例中是抽象的)的方法。
The difference is that if you could use abstract methods in this case you'd see a "Class must implement method" error when you try to run your code (any code), and your IDE would highlight the error.
不同的是，如果你可以使用抽象方法在这种情况下，你会看到一个“类必须实现的方法”的错误时，你试图运行你的代码(任何代码)，以及你的IDE会突出显示错误。
You might wonder what the use is of abstract classes in such a case.
你可能想知道什么是使用抽象类在这种情况下。
You might wonder what the use is of abstract classes in such a case.
你可能想知道什么是使用抽象类在这种情况下。
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