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Elementary School Classroom: Enthusiastic Teacher Holding Tablet Computer Explains to a Brilliant Young Children How Wind Turbines Work. Kids Learning about Eco-Friendly Forms of Renewable Energy

视  频 ID：  1040021414
版      权：  Gorodenkoff
视频长度：  0:13
横纵比率：  16:9
所属分类：  人物 教育 
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