The interaction overview diagram can be thought of as an activity diagram that has been restricted to control flows and embedded sequence diagrams.
交互概览图可以看做是一个活动图，只不过被限定为控制流程和嵌入的序列图。
Interaction diagrams can include sequence, communication, an interaction overview, and timing diagrams.
交互图包含序列、通信、交互总览，及时序图。
Interaction overview diagram: an interaction overview diagram is a variant of the activity diagram in which the nodes represent interaction diagrams.
交互总览图：交互总览图是活动图的变体，它当中的节点表示交互图。
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