In other words, in what frequency is the use case used within the system?
换句话说，用例以何种频率在系统中使用？
The “endogenous” factors (those originating within the system) seem so much more important.
相比之下，“内源性”因素（来自本系统内部）似乎重要得多。
Interaction within the system must also be considered.
系统内部的相互作用也必须加以考虑。
Within the system are several sub-systems.
系统内部又分了几个子系统。
Within the system are several sub-systems.
系统内部又分了几个子系统。
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