SV - 4系统功能描述确定系统行为及与该行为相关的信息流。
SV-4 Systems Functionality Description Identifies system behavior and the information flow related to that behavior. Activity Diagram for each system use case 8.
它们在高层次上描述系统的功能。
They describe the functionality of the system at a high level.
这个层中的流程位于系统边界之外，并不描述系统功能，因此不需要对应的系统用例。
The processes in this layer lie outside the system boundary, and don't describe system functions, so there's no need for a corresponding system use case.
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