Similar to the sequence diagram, the communicationdiagram can also model the dynamic behavior of the use case.
类似于序列图，通信图也对用例的动态行为建模。
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However, a communicationdiagram focuses more on showing the collaboration of objects than on the time sequence.
然而，通信图更看重对象的协作，而不是时间序列。
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Composite structure diagram: a composite structure diagram explores runtime instances of interconnected instances collaborating over communication links.