Young engineering student studies hard at desk preparing for exam 免版税图库摄影 young engineering student studies hard at desk preparing for exam
Young engineering student studies hard at desk preparing for exam 图库摄影 young engineering student studies hard at desk preparing for exam
年轻的工程学院学生在他的桌子上焊接一个简单的有线兰伯特LED二极管，特写镜头显示双手拿着烙铁 免版税库存照片 年轻的工程学院学生在他的桌子上焊接一个简单的有线兰伯特LED二极管，特写镜头显示双手拿着烙铁
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