您可以使用此类的成员在加载或卸载外接程序时运行代码、访问宿主应用程序的对象模型，以及扩展应用程序的功能。

You can use members of this class to run code when the add-in is loaded or unloaded, to access the object model of the host application, and to extend features of the application.

youdao

您可以使用此类的成员在加载或卸载外接程序时运行代码、访问宿主应用程序的对象模型，以及扩展应用程序的功能。

You can use members of this class to run code when the add-in is loaded or unloaded, to access the object model of the host application, and to extend features of the application.

youdao