Such clocks could help spot tiny changes in physical constants over time.
这种时钟能够帮助认出物理常数如何随着时间所作的极为微小的变化。
A seismometer is a seismograph whose physical constants are so well known.
地震计是一种地震仪器，其物理常数是已知的。
Fundamental physical constants By the US National Institute of Standards and Technology.
物理基础常数，由美国国家标准和技术会提供。
Fundamental physical constants By the US National Institute of Standards and Technology.
物理基础常数，由美国国家标准和技术会提供。
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