Class and Interface Declarations 类和接口声明 ; 类和接口的声明
This file provides the type signature so that this interface can be used in method declarations for other interfaces.
这个文件提供类型标记，从而使这个接口能用于其它接口的方法声明。
This is where the interface comes into picture which maintains all the procedure declarations and data types that client and server agreed upon.
这就是接口起的作用，接口维护客户机和服务器都认可的所有过程声明和数据类型。
These annotations are placed on method declarations within a user-defined interface.
这些注释被放在用户定义接口中的方法声明上。
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