[lái zōng qù jì]   

来    踪    去    迹    指人的来去行踪。

踪：行踪；迹：痕迹。指人的来去行踪或事物的前因后果。

The footprints leading to a certain point and from these onwards the traces left behind

来鸿去燕    来踪去路    来者不拒    来日大难    来之不易