【検証】ダンボールだけでボート作ってみたら浮く？沈む？学校のプールで試してみたら・・・【夏休みの自由研究】
Published July 29, 2026
Views 154K | Likes 1.40K | Comments 107
Ranked #11,221,128 globally by view count, this video has accumulated 154K views since it was published on Jul 29, 2026.
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