5视频豆瓣9.2
1视频豆瓣8.9
10视频
6视频
7视频豆瓣7.5
穿着长袍的年轻理科女生在白板上写公式,转身直接对着镜头微笑。
Young female science student in a robe writing formulas on a whiteboard, while turning around and smiling directly at the camera.
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