The results agree with previous studies that have analyzed single photons whose precursor and main wave form have not been separated, which have reported an oscillatory structure.

结论与先前的研究相同，虽然先前的研究分析的是尚未将前驱和主波分离的光子，它们显示出了一个振荡结构。

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The scientists found that the precursor wave front of a single photon always travels at c, like the signal velocity of large groups of photons.

科学家发现，单个光子的前驱波头一般以光速c传播，就像由大量光子携带的信号的传播速度一样。

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The atoms had an effect called electromagnetically induced transparency (EIT), which enabled the scientists to separate the single-photon precursors from the main wave packet.

这些铷原子可以产生一种称为“电磁感应光透明”(EIT)的效应，可以帮助科学家从主波包中分离出单个光子前驱。

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We have always had huge day-to-day and year-to-year variations in our weather, and we always will do, and a couple of cold winters are no more evidence that climate change has stopped than a single summer heat-wave proves that global warming is happening.

BBC: Time to spend more money preparing for colder winters?

They believe the single currency is likely to lead first-wave members, possibly quite soon, to co-ordinate their economic, fiscal and even social policies ever more closely.

ECONOMIST: Euro-apartheid?

The new single currency has also set off a wave of cross-border mergers and acquisitions.

ECONOMIST: Wo ist Goldilocks?