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然后她读了关于季节性情感障碍的书，这是一种发生在秋天和冬天的抑郁症；而她真的看到了光。

Then she read about seasonal affective disorder, a form of depression that occurs in fall and winter, and she saw the light—literally.

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光谱学基本上是一种研究光谱和光谱线的学科，特别对我们来说，是研究恒星发出的光。

Spectroscopy is basically the study of spectra and spectral lines of light, and specifically for us, the light from stars.

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So, we'll take a little bit of a step back after we introduce quantum mechanics, and talk about light as a wave, and the characteristic of waves, and then light as a particle. And one example of this is in the photoelectric effect.

等我们介绍完量子力学后,我们要回过头来讨论下光,作为一种波和它的波动性特征,以及光作为一种粒子,其中的一个粒子就是光电效应。

麻省理工公开课 - 化学原理课程节选

So, now we can talk about it in different terms, Ei for example, talking about e sub i, which is the incident energy or the energy of the light that comes in, or talking about work function here, and that's just another way to say threshold energy.

现在我们可以从不同的方面,来谈论它了，举例来说，它是入射能量或者进来的光的能量,或者谈论这里的功函数，它是另一种描述临界能量的方式。

麻省理工公开课 - 化学原理课程节选

And sometimes we model light as a wave.

有时候我们把光看成一种波。

麻省理工公开课 - 固态化学导论课程节选