可见光由不同的颜色或波长组成，它们共同组成了所谓的光谱（一段颜色），就像你在彩虹中看到的那样。

Visible light consists of different colors or wavelengths, which together make up what's called spectrum, a band of colors, like you see in a rainbow.

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用微笑和幽默来打破紧张气氛，强调这是段友好的谈话，并且所有人都在朝着共同的目标努力。

Break the tension with smiles and humor to reinforce the idea that this is friendly discourse and that all are working toward a common goal.

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赌博永远是美国人生活的一个共同特征，但很长一段时间以来，它被广泛地认为是一种罪恶，抑或是一种社会疾病。

Gambling has been a common feature of American life forever, but for a long time it was broadly considered a sin, or a social disease.

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I asked you in the final question to just get on a couple of websites, The Federal Reserve and the ICI, which is a mutual industry website, and write a little bit, a couple paragraphs about what this industry is really achieving or how it's trending.

我最后再要求你们,去浏览下一些网站，像联邦储备和美国投资公司协会网站，都是共同基金产业的网站，然后稍微写几段，关于这个产业的成就,或者他们的发展趋势。

耶鲁公开课 - 金融市场课程节选