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这种钟表通过电磁波的频率来计算时间,单位为百万分之一秒。
The clock measures the passage of time in millionths of a second by counting the frequency of electromagnetic waves.
youdao
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这种钟表通过电磁波的频率来计算时间,单位为百万分之一秒。
The clock measures the passage of time in millionths of a second by counting the frequency of electromagnetic waves.
youdao