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所有带有 time 标记的视频 (2)
Einstein and The Special Theory of Relativity
How Einstein (& others) discovered Special Relativity. Pi day (3.14) is Albert Einstein's Birth… Dad A+ 2012 年4 月2日 29 个视图
This Time is for Africa by Shakira (The Official 2010 FIFA World Cup Song)
Music video by Shakira featuring Freshlyground performing Waka Waka (This Time for Africa) (The Off… Dad A+ 2010 年12 月9日 24 个视图
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