A use case takes a "black box" approach to the system.

用例采用“黑盒”接近这个系统。

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Treating the system as a black box, identify environmental elements that interact with the system (the system actors) and the actual interactions and results (system use cases and resulting services).

将系统视为一个黑盒，确定与系统(系统参与者)交互的环境元素和实际的相互作用及结果(系统用例及产生的服务)。

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The number and scope of the levels are well defined: we have four distinct levels; company black box, system black box, logical design inside the system, physical implementation.

这些层次的数量和范围是定义完善的：我们有四个不同的层次：公司黑盒子、系统黑盒子、系统内的逻辑设计以及物理实现。

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