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。

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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。

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It will update your system clock time, synchronizing it with atomic clocks through the Internet.

该软件将更新你的系统时间，通过因特网使用原子时钟同步你的系统时间。

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Over a few decades this would amount to a minute's difference, but over several hundred years this would mean the atomic clock time-scale and the time-scale based on the Earth's rotation would be out by an hour.

BBC: Changes to the world's time scale debated

Jerrold Zacharias at the Massachusetts Institute of Technology developed a practical atomic clock around the same time that Louis Essen and John Parry established the first atomic clock at the National Physical Laboratory in Teddington, west of London.

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