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An engineer works diligently on an electronic circuit board in a laboratory. It is evening and they are focusing on the intricate details of the design using tools and technology

视  频 ID：  3927513587
版      权：  Kozyr Yevhenii
视频长度：  0:25
横纵比率：  0.56:1
所属分类：  科学 科技 
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