继承是一个耦合机制：它使用关于可见性、方法调度等定义明确的规则绑定两个实体。
Inheritance is a coupling mechanism: it binds two entities together with well-defined rules about visibility, method dispatch, and so on.
继承是面向对象语言的一个自然部件，许多开发人员忽视了这样的一个事实，继承的核心是一个耦合机制。
Inheritance is such a natural part of object-oriented languages that most developers lose sight of the fact that, at its heart, it is a coupling mechanism.
传输独立性：具有不依赖于特定传输或协议机制的实现的服务可促进松散耦合。
Transport independence: a service with an implementation that's not dependent on a specific transport or protocol mechanism promotes loose coupling.
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