I think you all know what ultraviolet light is.

我想，你们都知道紫是什麽。

Unlike humans, birds can see ultraviolet light.

与人类不同，鸟类可以看到紫。

And because of that, birds can also see ultraviolet light.

正因为如此，鸟类也能看到紫。

They're formed when ultraviolet light interacts with ethane you see.

它们是由于紫对作用形成，你看。

Specifically, high-energy ultraviolet light, like the UV rays in sunlight.

更准确地说，是高能紫，比如说日光中紫。

They see everything in slow-mo, plus they can see ultraviolet light.

它们以慢镜头观察一切，而且它们还能看到紫。

The U.S. Environmental Protection Agency lists products containing ethyl alcohol and hydrogen peroxide as likely being effective cleaners but the race is on to see what else can do the trick, essential oils, candles, ultraviolet light.

国环境保护署列出了含有醇和双氧水产品，这些可能是有效清洁剂，但目前还在寻找其他有效产品，精油、蜡烛、紫等。

These digital cameras can also be designed to detect ultraviolet light, infrared, and more.

数码相机还可以用来探测紫、等。

Cells sensitive mainly to green light and cells sensitive mainly to ultraviolet light.

主要对绿光敏感细胞，主要对紫敏感细胞。

It is disinfecting using a form of ultraviolet light called UVC.

它使用一种叫做UVC紫进行消毒。

The system uses a clear liquid that can only be seen under ultraviolet light.

该系统使用了一种只有在紫下才能看到透明液体。

Sometimes ultraviolet light is used to encourage plant growth.

有时紫被用来促进植物生长。

And there are stickers that you can place on the outer surface of glass that absorb ultraviolet light, but because you can't see it, it's hard to assess how effective they might be.

因此可以将这种贴纸贴在玻璃表面，从而吸收紫光，但由于你看不见这些贴纸，所以很难评估它们有多大效果。

For 2 billion years, all organisms on Earth are unicellular, and they likely lived in the oceans, shielded from the hard ultraviolet light of the sun but then something remarkable happened, Photosynthesis.

20亿年以来，地球上所有生物都是单细胞，它们很可能生活在海洋中，不受太阳紫照射，但随后发生了一件非同寻常事情，就是光合作用产生。

So, if we could see the night sky in ultraviolet light, then almost all the stars would disappear and all that we would see are these spectacular births and deaths.

如果只能看到夜空里紫，现在星星就都不见了，只剩下恒星壮丽诞生和毁灭。

Many now use trash can–shaped robots to disinfect walls with ultraviolet light (the rooms have to be empty because the light is harmful to humans too).

现在很多人用垃圾桶形状机器人用紫给墙壁消毒(房间必须是空，因为紫对人类也有害)。

Beer, for example, has a light-sensitive chemical called " isohumulone" inside of it that breaks down into free radicals when struck by ultraviolet light.

比如，啤酒里面含有一种叫做“异葎草酮”化学成分，它对光很敏感，当紫照射时，它会被分解成自由基。

The water reuse treatment process usually involves disinfecting wastewater with ozone gas or ultraviolet light to remove viruses and bacteria.

水再利用处理过程通常包括用臭氧气体或紫对废水进行消毒，以去除病毒和细菌。

Strong forces can still be felt through the fabric, and its fibers gradually lose strength under ultraviolet light.

在紫照射下，织物仍能感受到强大力量，纤维会逐渐失去强度。

The reindeer is also one of the only mammals on the planet that can see ultraviolet light.

驯鹿还是为数不多能看到紫哺乳动物之一。