第 112 集: 大雄與哆啦A夢使用暫時逆轉道具研究物品起源

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Nobita is doing his schoolwork for once in his life. The project calls for him to learn about the origin of items around his house. Doraemon happy that Nobita is doing his work, willingly pulls out a gadget that reverse items to their origin for 15 minutes. (Source: Wikipedia)