But before the UV lights turn on, safety measures are taken.

但是打开外线灯之前，要采取安全措施。

Certain pigments glow under UV light, exposing traces that would have been otherwise invisible.

某些色外线下会发光，暴露出原本看不见的痕迹。

But under UV light, these strips really shine.

但是外线下这些细线确实会发光。

When we lay in the sun, our skin absorbs two types of UV light.

当我们阳光下躺的时候，我们的皮肤会吸收两种外线。

In several places, there are large holes that let in pure UV light.

几个地方，甚至出现了臭氧漏洞，导致太阳直射。

And nobody there. And there's actually insects that come in because we run a UV light.

他们都不这里。实际还有昆虫进来，因为有外线灯。

It's dark green because they have this particular pigment protecting them from the access of UV light.

这是深绿色的, 因为它们有这个特殊的色保护自己不受外线的侵害。

All forms of UV light are known to be harmful to the skin and to the eyes.

众所周知，所有形式的外线都对皮肤和眼睛有害。

But Molina and Rowland showed that in the stratosphere, they're broken apart by UV light, releasing chlorine atoms.

但莫利纳和罗兰表明了平流层里，它们被外线分解，释放出氯原子。

One the coronavirus hit, he and his team looked at ways to deploy UV light to fight the virus.

当病毒来袭时，查普伊和他的团队研究了利用外线来对抗病毒的办法。

Over 100 years ago, UV light was first used to disinfect drinking water in Masse, France.

100多年前，外线法国马赛首次被用于净化饮用水。

This was a problem because although UV light can damage skin, it also has an important parallel benefit.

那么问题来了，外线虽然伤害皮肤，但是它有一个相当重要的好处。

Your body makes a dark pigmented molecule called melanin that absorbs UV light to protect your skin from damage.

你的身体会产黑色来保护你的皮肤。

Finally, the tech turns the UV light back on, and sees how much longer the participants last before turning red again.

最后，技术人员再次打开外线灯，观察参与者的皮肤经过多久会再次变红。

When scientists photographed this archer's legs under UV light, they saw this: a dizzying array of geometric patterns and saturated colors.

当科家外线下拍摄这个弓箭手的腿时，他们看到了这个：令人眼花缭乱的几何图案和饱和的颜色。

After printing, some bioinks will stiffen immediately; others need UV light or an additional chemical or physical process to stabilize the structure.

打印完成后，有些物墨水会立即变硬；有些则需要外线，或额外的化或物理加工来稳定结构。

And there is actually insects that come in because we run a UV light and then they can practice on their own.

事实，昆虫也会进来，因为我们使用外线灯，它们就可以自己练习了。

Most bats have decent vision and some species like fruit bats actually have particularly good vision and can even see UV light.

大多数蝙蝠的视力都不错，而像果蝠这样的物种其实视力特别好，甚至可以看到外线。

Right. And finally, there's air disinfection — for example, using UV light to " kill" or inactivate a virus in the air.

是的。最后一个重点是“空气消毒”——比如使用外线灯“杀死”空气中的病毒或使其失去活性。

They were exposed to small enough amounts of light that melanoma was less likely, and their lighter skin better absorbed the UV light.

他们暴露少量但是充足的阳光下，不仅能避免黑色瘤的形成还能更好地吸收外线。