cesium time and frequency standard
primary time and frequency standard 原级时频标准 CESIUM TIME AND FREQUENCY STANDARD 铯原子钟 time-and-frequency standard 时频标准 ..
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cesium time and frequency standard
铯时频标准
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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This is the basis for the well - known cesium clock, presently the standard of frequency and time.
这就是众所周知的铯原子钟的基础，它是目前的频率和时间基准。
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