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

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