管理是松耦合问题的关键，而松耦合是服务抽象的核心架构原则。
Management is the key to loose coupling-the core architectural principle behind the service abstraction.
让我们对照核心抽象层次原则来测试我们的示例。
Let's test our example against the core level of abstraction principles.
这也正好说明了这样一条原则：好的抽象能够让任何事物更为有用。
This perfectly illustrates the principle that good abstractions make everything more usable.
这也正好说明了这样一条原则：好的抽象能够让任何事物更为有用。
This perfectly illustrates the principle that good abstractions make everything more usable.
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