Many systems are designed at three primary levels: system, subsystem, and component, as shown in Figure 1.

许多系统是在三个主要层次上设计的：系统、子系统和组件，如 图 1 所示。

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Elasticity in a system or component of a system (I'll use software as an example, since I work with IBM WebSphere eXtreme Scale every day) implies three specific degrees of freedom

系统或系统组件中的弹性（我将以软件为例，因为我每天都与 IBM WebSphere eXtreme Scale 打交道）暗示三种特定的自由程度

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ERBAC model is composed of three parts: system component, database and human-machine interface.

ERBAC模型的实现主要包括系统组件、数据库和人机界面三部分。

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After putting together the first piece in roughly three weeks, the next step is completing the platform and building out the "virtual reality" component of the system.

ENGADGET: vi-RABT improves ankle rehabilitation with virtual reality and robotics