其新增的核心构造物包括：交互发生(Interaction occurrence)，允许从一个交互引用到另一个，这样避免了复制，结构上更优化;新增的组合片断、交互操作符等，使得在顺序图中可以表示诸如选择、...
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An interaction occurrence element is drawn using a frame.
一个交互进行元件使用一个框架绘制。
Starting in UML 2, the "Interaction Occurrence" element was introduced.
在UML 2中开始，引进“交互进行”元件。
In such cases the lifeline is shown as a normal lifeline and is not hidden by the overlapping interaction occurrence.
在那种情况下，生命线和正常的生命线一样显示，不会被重叠的交互进行隐藏。
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