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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China digital television terrestrial broadcasting standard GB20600-2006 is based on TDS-OFDM (Time-Domain Synchronous orthogonal Frequency Division Multiplexing) systems.

中国地面数字电视广播标准GB20600 - 2006是基于时域同步-正交频分复用(TDS - OFDM)系统的。

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A new tool that can test the clock base frequency error of energy measuring devices and provide GPS standard time to calibrate real-time clock was introduced in this paper.

介绍了一种用来测量电能计量装置的时钟基频误差，并提供GPS标准时间以校准其实时时钟的新型工具。

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The LTE standard supports FDD (Frequency Division Duplexing) mode adopted by DOCOMO and TDD (Time Division Duplexing) mode expected to be adopted for LTE networks in China and other markets, which will help to further the development of advanced mobile devices by manufacturers worldwide.

ENGADGET: Panasonic, DoCoMo, NEC and Fujitsu create IP for multi-standard LSI chip; supports LTE, GSM, W-CDMA and HSPA+