这些定义的形式都相同，类型参数名称后接类型的类边界和接口边界(若存在)的字段描述符。
These each take the form of a type parameter name followed by the field descriptors for the class bound and interface bounds (if any) of the type.
模型-视图-控制器(Model - View - Controller)模式指导我们有效地分割代码，在用户接口和模型之间定义一个良好的边界。
The Model-View-Controller pattern taught us to effectively partition our code along a well-defined boundary between the user interface and model.
服务定义（服务的范围、接口和边界）
Service definition (the scope, interface, and boundaries of a service)
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