如果正在建立用例方案的模型，那么序列图通常表示与外部实体的交互。
If you're modeling a use case scenario, your sequence diagrams will generally represent an interaction with an external entity.
系统中采用了活动图、 用例图、顺序图、交互图和类图建立沉积相建模系统的分析和设计模型。
The activity diagram, use case diagram, sequence diagram, collaboration diagram and the class diagram are used for building the analysis and design model of the sedimentary facies modeling system.
以用例视图为例，通过分析编辑模型的名词和动词，设计对象和类，经数次迭代后建立其顺序图。
Taking use case view as an example, sequence diagrams were built up through the analyzing noun and verb of edit model, designing object and class, and iteration time after time.
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