Generate a 5-second video of a school class photo session. A female teacher stands in the center with a bouquet, surrounded by animated children in school uniforms. For the first 2 seconds, everyone is standing still, posing for the camera. From 3 to 5 seconds, the children cheer "Hurray!" with natural, joyful movements — smiling, raising arms slightly, bouncing on their toes. No sudden or exag...
