The reason for that color shift was murky-perhaps for UV protection or camouflage.

颜色变化的原因尚不明朗，许是为了防紫外线或伪装。

That means they contain ingredients like avobenzone and octinoxate that absorb UV rays to stop them from damaging the DNA in your skin.

它们含有像阿伏苯宗和辛酸盐这样的成分，可以吸收紫外线，防止其损害皮肤中的脱核糖核酸。

Perhaps eventually we could see life re-emerging slowly as traits, such as reduced oxygen-concentration concentration requirements and increased cellular resistance to UV radiation evolve via natural selection and mutation in both plants and animals.

许最终，我们可以看到生命慢慢地重新出现，通过自然选择和动植物的突变，降低了对气浓度的求，增强了细胞对紫外线辐射的抵抗力。

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

某些色素在紫外线下会发光，暴露出原本看不见的痕迹。

You need a lot of eumelanin to absorb UV rays.

你需大量的真黑色素来吸收紫外线。

However, that comes with the need to protect ourselves against those UV rays.

然而，这是为了保护我们自己免受紫外线的伤害。

But with UV vision, a reindeer can see things in much greater contrast.

但有了紫外线视觉，驯鹿能看到对比度更高的东西。

The ozone layer, our protection against the sun's UV rays, is made of oxygen.

气组成的使人免受紫外线伤害。

This layer absorbs up to 99 per cent of the sun's damaging ultra-violet (UV) rays.

吸收了高达99%的破坏性紫外线辐射。

UV radiation isn't the only way to damage cells, though, right?

紫外辐射并不是导致细胞损伤的唯一方式。

Double-paned and tempered. UV rays can't penetrate. You see the appeal now? -Hmm.

双钢化玻璃。隔绝紫外线。发现此地迷人之处了吧？-有趣。

“we went under a power line, and someone said they give off UV.”

稍后，“我们从输电线下走过，有人说输电线会放射紫外线。”

So, Sarah continues and says that sunglasses help protect our eyes from UV rays.

于是，莎拉接着说，太阳镜有助于保护我们的眼睛免受紫外线伤害。

Something they can do much better is look at what happens when a variable such as UV is altered, compare that with the data, and thus gain insight into the mechanisms by which climate works.

它们还有更大的作用，它们能观察当一个变量改变时（如紫外线）会发生什么，并与数据作比较，从而洞察出气候变化的机制。

Rather than washing jeans, some people find other ways to freshen them up such as putting them in the freezer, spraying them with vinegar or hanging them in the sun for a " UV wash" to kill off bacteria, O'Neill said.

奥尼尔说，有些人不洗牛仔裤，而是想其他办法让其焕然一新，比如把它们放在冰箱里，喷醋，或者挂在阳光下“照射紫外线”以杀死细菌。

And just to look at the sheer numbers globally, they're just much larger pool of options that manufacturers can draw from, which helps the consumer because they're just more products out there, they're protecting a wider range of UV light.

仅从全球数目繁杂的品类来看，紫外线防晒剂是制造商可以提取的大部分选择，这对消费者有益，因为它们可以有更多的产品，它们保护着更大范围的紫外线。

And when we find when you look inside the jumping spider retina you'll find photo receptors that are more sensitive to UV or ultraviolet wavelengths, closer, and then deeper or potentially longer wavelength.

当你观察跳蛛的视网膜时，你会发现光受体对紫外线更敏感，更近，然后更深或可能更长。

UV can be a very, very powerful mutagen for DNA and what it does specifically, is these C-bases, these green bases, it can turn them into T-bases, these red bases.

紫外线对 DNA 来说是一种非常非常强大的诱变剂，它具体的作用是，这些 C 碱基，这些绿色碱基，它可以把它们变成 T 碱基，这些红色碱基。

But these results do not suggest that people should stop using sunscreen to protect against the sun's harmful ultraviolet (UV) rays, researchers said.

但研究人员称，这些结果并不意味着人们应该停止使用防晒霜来抵御太阳有害的紫外线。

It would involve the use of gigantic hoses or high-powered chemical cannons to spray chemicals into the stratosphere to act as a reflective barrier against sunlight and harmful UV rays.

该技术需用到巨型水管或是一种高性能的化学加农炮向平流喷洒化学物质以起到反射屏障的作用阻隔阳光和有害的紫外线。