这个顺序活动包括一个嵌套的活动序列。

The sequence will contain a nested list of activities.

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Synapse有一个缺省的活动序列，应用于按这种方式到达的任何消息。

Synapse has a default sequence of actions that applies to any messages that arrive in this way.

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活动图：活动图提供对系统行为的视图，它描述了过程中的活动序列。

Activity diagram: An activity diagram provides a view of the behavior of a system by describing the sequence of actions in a process.

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