0-6歲必看超實用科普動畫《瑞奇寶寶英文版》，兒童益智動畫片推薦，非常適合親子優質早教，一個個充滿友誼、愛和溫暖的成長小故事 P6 - 第8集 Hoop 呼啦圈

Baby Rikki and friends learn about the difference between circles and ovals. After Pandy's hula hoop is accidentally deformed, the characters discover that the new shape is an oval. Through a song and examples, they learn that an oval is like a stretched or squashed circle, helping children identify this shape in the world around them.