Best Video/地球が中空だったら？「What if the Earth were Hollow?」

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 * author=Gaijin
 * publishingtimestamp=2012/09/14 17:00
 * title=地球が中空だったら？「What if the Earth were Hollow?」
 * categories=科学
 * leading=地球が中空だったら？.
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