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。

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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。

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The host view of the add-in is the abstract base class or interface that describes the methods used by the host and the add-in, as specified in the contract.

增益集的主检视为抽象基底类别或介面，会描述主机和增益集使用的方法，如合约中所指定。

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The host view of the add-in is the abstract base class or interface that describes the methods used by the host and the add-in, as specified in the contract.

增益集的主检视为抽象基底类别或介面，会描述主机和增益集使用的方法，如合约中所指定。

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