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

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

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

它通过吸收太阳的两种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%以上的黑色素瘤是由过度暴露于外线辐射所引起的。

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

由于大气稀薄无法外线的辐射。

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.

太阳光是由电磁波组成的，也是我们接收到的外线的主要来源，它有相较可见光更短的波长 也带有更多的能量。

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的是——离柱子非常近，质量极度巨大，极其明亮，也极其炙热的许多恒星；恒星释放出巨量的外辐射，塑造出了它们周边的景象。

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.

现支持了其他证明木卫二上有羽状水汽的证据，木卫二上的海洋水量可能是地球上所有海洋水量的两倍。2012年，美国宇航局哈勃太空望远镜收集到了外线辐射证据，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.

活着的一浅水珊瑚会闪闪光：它们吸收来自太阳的外线辐射，可能会抑制其他生物的生长，然后将其以可见光的形式出，呈现出美丽的颜色。

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，笼罩在强烈的外线辐射之中，没有在水中移动的那种相对轻松的浮力。

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的氧气、有害的外线辐射、土壤盐碱化以及有时覆盖地球大部分地区的沙尘暴。

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，臭氧层的恢复有望减少太阳有害外线对人类的辐射，避免因此导致的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.

在上方的平流层中，臭氧层使得有害的外线不能进入地球。

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

只是意味着你的角膜暴露在更多的外线辐射下，比它们习惯的要多。

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

外线照射也可以加速颜料的分解，当然，防晒霜可以起到一保护作用。

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

有癌症是人体细胞内的病变引起的，有癌症则是由外线、烟草烟雾或化学物质引起的。

We get melanoma mainly by exposure to ultraviolet radiation.

我们主要通过暴露于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的天气，但我们应该确保安全地进行， 并记住某人群比其他人更容易受到高温或外线辐射的影响。

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的化学反应，减缓臭氧层的恢复， 并使更多致癌的外线辐射到达地面。

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.

因为它在强烈的热带阳光下度过了很长时间，---草鼠还进化出两种独立的防护措施来抵御太阳的外线辐射。

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.

那是地球大气中的一部分，能够吸收大部分来自太阳的外线辐射，防止地球过热。