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物理有多有趣？ - 知乎
source link: https://www.zhihu.com/question/31063539/answer/746287866
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这是一个蘑菇头陀螺：它有一个球壳形的大头，里面插一根很细的茎。找个平面用力一扭一撒手，它就滴溜溜地…
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