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你了解原子钟吗？2000万年的误差为一秒！GPS卫星系统就用它！时钟是人类生活中不可或缺的工具，也是测量时间的重要仪器。然而 ... 但它与全球导航系统（GPS）密切相关。顾名思义，原子钟的精度达到了 ...
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