4视频豆瓣7.6
5视频
22视频豆瓣6.8
豆瓣6.0
9视频豆瓣5.9
6视频豆瓣6.1
13视频豆瓣7.0
一名年轻学生在长方形网格笔记本内勤奋地绘制了一张细致的数学图表,旁边放着一个计算器。
Top shot of a young student diligently sketching a meticulous mathematical chart within the rectangular grid notebook with a calculator by the side.
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