放屁没什么大不了-铁皮人儿童教育启蒙故事

放屁没什么大不了-铁皮人儿童教育启蒙故事

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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