The Doomsday Clock isn't a clock and it doesn't keep time. It's a metaphor introduced by The Bulletin of the Atomic Scientists to gauge public safety.
末日时钟并不是真正的计时钟表，而是一面虚构的钟面，由芝加哥大学的《原子科学家公报》杂志于1947年设立，以标示出世界受核武威胁的程度。
At the US Naval Observatory in Washington, its newest atomic clock is getting a climate-controlled room of its own for the first time.
在位于华盛顿的美国海军天文台，这里最新的原子钟首次得到了一个拥有空调的专用房间。
Rubidium atomic clock is used for the time reference signal in the system, by which the user can get the positioning information without sending any signal.
该系统用高稳定度铷钟作为时间基准信号，实现了无源导航定位功能。
Based on available frequency standards: one prototype laboratory model of cesium clock, three hydrogen clocks and several (2-6) rubidium clocks, the SO atomic time scale has been established.
利用我们现有的标准，一台试验型实验室铯束标准，三台氢原子钟以及若干台(2 -6)铷气泡标准来建立原子时尺度。
The synergetic method mainly includes: noise-separating method based on time sequence model of atomic clock and malfunction - separating and positioning method based on malfunction-tree.
该方法的内容包括：原子钟一阶模型的噪声分离方法和故障树的故障分离、故障定位方法。
A time keeping system consists of atomic clock assembly, measuring and comparing system and computation of atomic time scale, etc.
守时系统是一种需要连续、可靠运转的复杂系统，包括守时钟组、比对测量系统、原子时归算等多个环节。
A time keeping system consists of atomic clock assembly, measuring and comparing system and computation of atomic time scale, etc.
守时系统是一种需要连续、可靠运转的复杂系统，包括守时钟组、比对测量系统、原子时归算等多个环节。
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