你需要两只激光器，一个无光的真空的空腔和一些铷- 85元素。

You need two lasers, a vacuous, light-free space and some Rubidium-85.

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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。

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.

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随着光前驱和主波包通过第二组铷原子，科学家就可以对这两个光子成分的速度进行测量。

As the optical precursor and main wave packet traveled through a second group of rubidium atoms, the scientists took measurements on the speed of the two photon components.

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So, for example, here we're showing rubidium and potassium and sodium plotted where we're plotting the frequency -- that's the frequency of that light that's coming into the metal versus the kinetic energy of the electron that's ejected from the surface of the metal.

让大家看来都是可以理解的事情,就是把不同金属的观测结果,画到一张图里面来，例如这里,我们展示的是钠，钾,铷的频率-这是照射金属的光的频率,和金属表面出射电子动能的关系。

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