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Middle Aged Industrial Turbine Specialist in Glasses Standing at a Table With an Innovative Invention. PhD Professor Using Laptop Computer to Develop a High Tech Prototype Electric Motor

视  频 ID：  1098933877
版      权：  Gorodenkoff
视频长度：  0:20
横纵比率：  1.90:1
所属分类：  科学 科技 
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