Meaning: This sentence describes laughter spreading and filling the air with happiness.
Choice of Words: "Laughter" is the act of making sounds expressing amusement or happiness, and "echoes" means to be repeated or heard again. "Joy" is a feeling of great pleasure and happiness, and "fills" means to make something full. "Air" is the mixture of gases that surrounds the Earth. Together, it creates a lively image of laughter spreading through the air, filling it with joy.