slow children crossing school crossing student yellow sign symbol design element - 小學教學大樓 幅插畫檔、美工圖案、卡通及圖標重返校園
first day of school. students and teachers greet each other on the first day of school. - 小學教學大樓 幅插畫檔、美工圖案、卡通及圖標兒童
