【熱伝導】「なぜ38度の日は暑いのに38度の風呂は熱くないの？」中学生の自由研究に絶賛 試行錯誤の末に結論を導く
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![だからウナギの旬は冬だと言っているだろ。 [194767121]](http://matome-ch.com/image/5/8304925.jpg)
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