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本书讲述了：为什么直升机能停在空中？火车为什么要在轨道上行驶？船为什么能浮在水面上......喜欢刨根问底的小问号又提出什么奇怪的问题？总是想当然的小天真又闹了什么好玩的笑话？来来来，快跟着小问号和小天真一起来听动脑筋爷爷讲故事。
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