The word 遗留 (yíliú) is a compound verb formed by combining two characters with closely related meanings: 遗, which means "to leave behind" or "to bequeath," and 留, which means "to remain" or "to stay." Together, they create a synergistic meaning where 遗 emphasizes the act of leaving or handing down (often from the past or a predecessor), and 留 reinforces the idea of that thing continuing to exist or persist into the present. Thus, 遗留 as a whole means "to leave behind," "to hand down," or "to be a legacy of," typically referring to objects, problems, influences, or traditions that remain from an earlier time.