The word 影响力 is formed through a metaphorical and conceptual blend: it combines the image of a "shadow" (影) and an "echo" (响) to evoke an indirect but pervasive effect, like a shadow that follows or an echo that lingers, and then attaches the concept of "power" or "force" (力) to this image. This creates a single notion meaning "the power to produce an effect without direct action", encapsulating the idea of influential power that spreads and endures, much like a shadow's presence or a sound's resonance.