缩小的动画显示数学方程和计算手写的粉红色粉笔移动在深蓝色黑板背景 — 图库影像片段
缩小的动画显示数学方程和计算手写的粉红色粉笔移动在深蓝色黑板背景
— 视频影像vectorfusionart- 作者vectorfusionart
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