首先要声明服务接口，如清单2 所示。
So you'll declare your service interface, as shown in Listing 2.
分布类中是否重新声明它所实现的接口也是可选的。
It is always optional to re-state any base interface in a partial class.
List的源代码中真的显式声明了那么多接口吗？
Does the List source code actually state all those interfaces?
第一个是头文件（.h），用于声明类接口；
The first is the header (.h) file that declares the interface of the class.
用interface关键字声明接口。
匿名对象的接口通过一个协议声明被发布。
The interface to an anonymous object is published through a protocol declaration.
另外，接口可以包含常量声明。
In addition, an interface can contain constant declarations.
接口可声明事件。
声明类、接口或成员具有公共可见性。
Declares that a class, interface, or member has public visibility.
声明类、接口或成员具有公共可见性。
Declares that a class, interface, or member has public visibility.
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