增益集开发人员只须实作增益集检视中的方法。
The add-in developer must implement only the methods in the add-in view.
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。
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.
管线的检视区段为抽象基底类别或介面，可根据合约的内容，为主应用程序和增益集提供其共用的方法检视。
The view segments of the pipeline are abstract base classes or interfaces that provide the host and the add-in with a view of the methods that they share, as defined by the contract.
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