An analogy that applies to levels of abstraction is that of a black-box view (a higher level that does not show implementation details) and a white-box view (an inside look at how things work).
与抽象级别类似的是黑箱视图(不显示实现细节的较高级别)和白箱视图(显示事物工作方式的内部视图)。
The external or "black box" view is what consumers of the service provider see.
外部的或者叫做“黑盒”视图是呈现给服务提供者的消费者查看的。
At the highest level of abstraction, we can view the system as a single entity (complex whole), or black box.
在抽象的最高级别上，我们可以将系统视作一个单个实体(复杂整体)，或黑盒。
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