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 specification, as shown in Figure 5.

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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。

In this case, we use an abstract class to define the service interface and operations of the exposed capabilities, as shown in Figure 3.

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此类的服务只有一个，它抽象在门户中定义的所有其他搜索服务。

There is only one such service and it abstracts all the other search services that have been defined in the portal.

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