逆向连接应从decision开始并引回merge。
The backward connection should begin in a decision and lead back to a merge.
要正确捕获循环流程，请在流程模型中添加连接上游活动的逆向连接。
To correctly capture cyclic processes, add backward connections to the process model that connect to an upstream activity.
业务用户通常绘制逆向连接来将流引回上游活动，如此图的下半部分所示。
Instead, business users usually draw backward connections that direct a flow back to an activity further upstream as it is shown in the lower half of the figure.
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