我在一篇软件杂志的文章中第一次看到与此类似的图。
I first saw a graph similar to this one in a software magazine article.
与接收或选择活动类似，此类事件处理程序可以对外部事件进行响应，从而提高其动态性。
Like pick or receive activities, such event handlers can react to external events, and make them more dynamic.
引用配置与此类似。
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