22 年前
视频简介
The true story of the smallest Green Beret soldier who became a war hero-only to be killed homeless and alone, whose life and death are shrouded in mystery.。知识动画《宝宝巴士数学小课堂》，通过情景模拟、图形事物和趣味游戏，帮助宝宝直观的认知数字，启蒙数学。。
标签
科学
国学