Meaning: When we were children, we used to laugh a lot and those happy memories still bring a smile to our faces.
Choice of Words: "Laughter" is the sound we make when we find something funny or enjoyable. "Echoed" means to repeat or reverberate a sound. "Through" means moving from one place to another. "Childhood" is the period of time when someone is a child. "Days" are periods of 24 hours.