A combined fragment is used to group sets of messages together to show conditional flow in a sequence diagram.

一个组合碎片用来把一套消息组合在一起，在一个序列图中显示条件分支。

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A combined fragment is used to group sets of messages together to show conditional flow in a sequence diagram.

一个组合碎片用来把一套消息组合在一起，在一个序列图中显示条件分支。

youdao