图9：用例分析模型，及其到其他模型元素的可追溯性链接。
Figure 9: the Use-Case Analysis model and its traceability links to the other model elements.
然而，通常基于UML的软件系统的四种模型中，从用例分析模型到其它设计模型之间存在一条很难逾越的鸿沟。
But there usually exists a gap which it is difficult to overstep from use case analysis model to other design models in four UML-based models of software system.
然而，通常基于UML的软件系统的四个模型中，从用例分析模型到其它设计模型之间存在一条很难逾越的鸿沟。
But there is a gap which it is difficult to overstep from use case model to other design models in four UML-based models of software system.
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