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研究表明：每人每天平均要放500ml屁，今天你放屁了吗？
《放屁没什么大不了》豆豆上课放屁被其他同学嘲笑。查阅资料后发现，放屁是很正常的消化反应，每个人都会放屁，所以放屁没什么大不了
知识科普绘本6/24
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