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      <title>万向支架的旋转：一枚陀螺如何用角动量守恒改写了人类导航史</title>
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      <description>1852年，法国物理学家傅科用一个旋转的圆球证明了地球自转。60年后，一个美国发明家将这个物理学玩具变成了改变航海历史的精密仪器。从钢铁船体的磁罗盘困境到斯佩里陀螺罗盘的诞生，从角动量守恒到进动现象，这是关于物理学如何拯救了一个时代的传奇。</description>
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