教师讲解数学公式 Teacher explaining mathematical formulas

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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视频来自： https://mixkit.co/free-stock-video/teacher-explaining-mathematical-formulas-4613/

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Man Medium Shot Smile University Education Teacher Class Point of View Shot College Classroom Class Room Math Blackboard Algebra

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