原子在两个能量等级之间震荡，所以钟的精确度为运行37亿年后误差不超过正负一秒。

The atom vibrates between two energy levels allowing the clocks accuracy down to a second in 3.7 billion years.

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图上的每个竖条表示一个刷新周期对应的一个值，刷新周期可以在一秒到数小时之间任意取值。

Each bar on the graph represents a value for one refresh interval, which can be anywhere from one second to many hours.

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结果是驾驶者意识到要减速到轻点刹车之间的间隔超过十分之一秒。

Turns out drivers knew they needed to slow down more than a tenth of a second before they tap the brakes.

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So, why should a non-frightening incongruity cause people to make a distinctive loud noise consisted of staccato segments of one fifteenth of a second each separated by a fifth of a second?

为什么不引起恐惧的不一致性,会让人们发出一种与别不同的声音,而且这种声音是间断的，一节声音持续15分之一秒,两节声音之间也是相隔15分之一秒？

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