放屁没什么大不了-铁皮人出品-小小科学家第一季故事-启蒙教育科普读物百科知识科学启蒙认识大自然

放屁没什么大不了-铁皮人出品-小小科学家第一季故事-启蒙教育科普读物百科知识科学启蒙认识大自然

iOS Universal Education

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Abstract:
Dear kids, have you ever been laughed at because you passed gas? Did you find that embarrassing? Do you know why do we pass gas? How much gas do you pass every day? Why is it so smelly? Why do some people pass gas all the time? …

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