For red, orange, yellow, green, blue, indigo and violet. Well, the color indigo just made news.

这些首字母分别代表红、橙、黄、绿、蓝、靛、紫。而靛色最近有了新消息。

The Japanese indigo plant, for example, makes the blue dye molecule in its leaves.

例如，日本靛蓝植物在其叶子中制造蓝色染料分子。

At nine feet in length, eastern indigos are considered to be the longest native snakes in the United States.

体长9英尺，东部靛蓝蛇是美国本土最长蛇了。

And the earliest known indigo blue textiles were from Egypt and they date to around 4400 B.P., before present.

此前已知最靛蓝色纺织品来自于埃及，距今大约4400年。

Duke Ellington and his orchestra recorded a famous song – Mood Indigo – about the deep blue color, indigo.

艾灵顿公爵（Duke Ellington）与其乐队录制了一首著名深蓝色歌曲：Mood Indigo。

And it's in South America that researchers recently found the oldest known example of fabrics dyed with indigo.

最近，研究人员就在南美洲发现了目前已知最靛蓝染色布料。

The researchers grow the microbes in liquid culture, where they replicate and divide to produce the indigo color.

研究人员在液体培养中培养这些微生物，让它们能复制和分裂，产生靛蓝颜色。

Historically, this color came from natural plant-derived indigo.

历史上，这个颜色取自于自然植物靛蓝色。

And so here we have microbes growing on a plate where they're producing indigo in the same way that the dye plant would make indigo.

我们微生物生长在这块平板上，它们生产靛蓝方式和染料厂生产靛蓝方式一样。

The star-strewn indigo sky was suddenly pitch black and lightless—the stars, the moon, the misty streetlamps at either end of the alley had vanished.

洒满星星深蓝色夜空突然变得一片漆黑，没有一丝光亮——星星、月亮、小巷两端昏黄路灯，一下子全都消失了。

Each letter stands for a different wavelength on the visible spectrum, which correlates with a different color seen with the naked eye -- red, orange, yellow, green, blue, indigo and violet.

每个字母代表可见光谱上不同波长，这与肉眼看到不同颜色有关联——红色、橙色、黄色、绿色、蓝色、靛蓝和紫色。

" And it was at that point that I realized we probably had indigo and it was probably the world's oldest indigo."

“就在那时我意识到，我们发现可能是是靛蓝色，而且这可能是世界上最靛蓝色。”

The sun slipped lower in the sky, which was turning indigo; and still the dragon flew, cities and towns gliding out of sight beneath them, its enormous shadow sliding over the earth like a great dark cloud.

太阳又滑下去一些，天空变成了靛蓝色。巨龙仍在飞行，它巨大影子像一大块乌云掠过地面，城市和集镇在他们下方远去。

The sun slipped lower in the sky, which was turning indigo; and still the dragon flew, cities and towns gliding out of sight beneath them, its enormous shadow sliding over the earth like a giant dark cloud.

太陽在越发靛青天空中低低得移动着；龙依然飞着，下面城镇出现在了视线里，巨兽影子在地面滑行着，像极了一朵庞大乌云。