I got off the swing, but my childhood still lingered in the air. what's the meaning

Childhood is getting farther and farther away from me. I got off the swing, and my childhood was still wandering in the air, indicating that the happiness of my childhood was not preserved with my growth, which was used to express the passing of my childhood and reveal a touch of sadness. I got off the swing, but I was still wandering in the air when I was a child. The Swing in Jiao Ye Law is a very sad poem.