High up in the atmosphere, ultraviolet radiation transformed oxygen into ozone and gave Earth a vital shield — the ozone layer.

在大气层高处，紫外线辐射将氧气转化为臭氧，为地球提供了一个至关重要屏障——臭氧层。

It protects every living thing by absorbing two types of ultraviolet radiation from the Sun.

它通过吸收太阳两种紫外线辐射来保护每一个生物。

More than 90 percent of melanomas are caused by too much ultraviolet radiation.

90%以上黑色素瘤是由过度暴露于紫外线辐射所引起。

The atmosphere is so thin, there is very little protection from ultraviolet radiation.

由于大气稀薄无法阻挡紫外线辐射。

Sunlight is composed of electromagnetic waves and is our primary source of ultraviolet radiation, which has a shorter wavelength than visible light and carries more energy.

太阳光是由电磁组成，也是我们接收到紫外线主要来源，它有相较可见光更短 也带有更多能。

What gives them their shape is the fact that fairly nearby there are some very, very massive, very luminous, very hot stars that are dumping out huge amounts of ultraviolet radiation. And it's sculpting the surroundings.

让柱子拥有如此外观是——离柱子非常近，度巨大，其明亮，也其炙热许多恒星；这些恒星释放出巨紫外辐射，塑造出了它们周边景象。

The findings support other evidence of plumes from Europa, whose ocean may contain two times as much water as all of Earth’s oceans. In 2012, NASA’s Hubble Space Telescope collected evidence of ultraviolet radiation which suggests a plume.

这些发现支持了其他证明木卫二上有羽状水汽证据，木卫二上海洋水可能是地球上所有海洋水两倍。2012年，美国宇航局哈勃太空望远镜收集到了紫外线辐射证据，暗示存在羽状水汽。

Alive, some corals in shallow waters shimmer: They absorb ultraviolet radiation from the sun, which can prohibit growth in other organisms, and then emit it as visible light, in beautiful colors.

活着一些浅水珊瑚会闪闪发光：它们吸收来自太阳紫外线辐射，这可能会抑制其他生物生，然后将其以可见光形式发出，呈现出美丽颜色。

Land was a formidable environment: hot, dry, bathed in intense ultraviolet radiation, lacking the buoyancy that makes movement in water comparatively effortless.

炎热、干燥，笼罩在强烈紫外线辐射之中，没有在水中移动那种相对轻松浮力。

They include a lack of breathable oxygen, harmful ultraviolet radiation, salty soil, and dust storms that sometimes cover much of the planet.

它们包括缺乏可呼吸氧气、有害紫外线辐射、土壤盐碱化以及有时覆盖地球大部分地区沙尘暴。

The recovery of the ozone layer is expected to reduce the sun's harmful ultraviolet radiation to humans, preventing skin cancer and cataracts.

分析认为，臭氧层恢复有望减少太阳有害紫外线对人类辐射，避免因此导致皮肤癌和白内障等疾病。

High up in what is called the stratosphere, the ozone layer keeps harmful ultraviolet radiation from reaching the earth.

在上方平流层中，臭氧层使得有害紫外线不能进入地球。

It just means that your corneas are exposed to more ultraviolet radiation, then they're accustomed to.

这只是意味着你角膜暴露在更多紫外线辐射下，比它们习惯要多。

Ultraviolet radiation can also contribute to this pigment breakdown, though it can be mitigated by the use of sunblock.

紫外线照射也可以加速颜料分解，当然，防晒霜可以起到一些保护作用。

Some arise because of problems within a person's cells; others are caused by ultraviolet radiation, tobacco smoke, or chemicals.

有些癌症是人体细胞内病变引起，有些癌症则是由紫外线、烟草烟雾或化学物引起。

We get melanoma mainly by exposure to ultraviolet radiation.

我们主要通过暴露于紫外线辐射而患上黑色素瘤。

Whilst many of us like to enjoy the sunshine and hot weather, we should make sure we do it safely and remember certain groups of people are more vulnerable than others to heat or ultraviolet radiation.

虽然我们很多人都喜欢享受阳光和炎热天气，但我们应该确保安全地进行， 并记住某些人群比其他人更容易受到高温或紫外线辐射影响。

It could, for instance, amplify chemical reactions that break down ozone molecules, slowing the recovery of the ozone layer and allowing more cancer-causing ultraviolet radiation to reach the ground.

例如，它可以放大分解臭氧分子化学反应，减缓臭氧层恢复， 并使更多致癌紫外线辐射到达地面。

Because it spends a lot of time in the intense tropical sun, --- the grass mouse has also evolved two separate safeguards against the Sun's ultraviolet radiation.

因为它在强烈热带阳光下度过了很时间，---草鼠还进化出两种独立防护措施来抵御太阳紫外线辐射。

That's the layer that's a part of the Earth's atmosphere that absorbs most of the ultraviolet radiation from the sun and stops the Earth getting too hot.

那是地球大气中一部分，能够吸收大部分来自太阳紫外线辐射，防止地球过热。