15视频豆瓣8.6
1视频豆瓣8.2
1视频
6视频
9视频豆瓣6.1
这位年轻的老师穿着西装,戴着眼镜,在黑板上解释数学公式,他走近镜头,友好地微笑着。
Young teacher dressed in a suit and glasses, explaining mathematical formulas on a blackboard, as he approaches the shot and smiles friendly.
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