Tenith Adithyaa, a teenager from India, used UV to make the leaves stay fresh for a year.

来自印度的青少年 Tenith Adithyaa 利用紫外线使这些叶子保持新鲜一年。

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A special material on the surface receives UV light from the sun.

表面的一种特殊材料接收来自太阳的紫外线。

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Sunglasses that provide 99 to 100 percent UV-A and UV-B protection will greatly reduce eye damage from sun exposure.

对紫外线a和紫外线b提供99%至100%保护的太阳镜，会大大减少由于暴露于太阳下所造成的眼损伤。

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So, ideally what we did see was, in fact, it does have enough energy with the UV lamp, it wasn't a dramatic shift you saw because we didn't start very high and then it went to that stuck point.

所以，理想上我们所看到的，事实上，紫外灯没有足够的能力，因为我们没有从非常高开始,所以它没有一个特别显著的移动,然后它又回到了黏着点。

麻省理工公开课 - 化学原理课程节选

We have a UV lamp right here, which is centered at a wavelength of 254 nanometers.

我们有一个紫外灯在这里，波长集中在254纳米处。

麻省理工公开课 - 化学原理课程节选

We can think about the Lyman series, which is 1 where n equals 1. We know that that's going to be a higher energy difference, so that means that we're going to be in the UV range.

我们可以来看看Lyman系,也就是n等于,我们知道它的能量差更大,所以它在紫外光区内。

麻省理工公开课 - 化学原理课程节选

Some Class 2 lenses beat the standard: Avaira, for example, block at least 75% of UV-A radiation and 99% of UV-B radiation, according to the package insert.

WSJ: Contacts Lenses That Let In Sun, But Block UV Rays

Only a limited number meet Food and Drug Administration standards for "Class 1" protection, in which 90% of UV-A radiation is blocked and 99% of UV-B radiation is blocked.

WSJ: Contacts Lenses That Let In Sun, But Block UV Rays

Furthermore, we believe the DVD (and broader optical disk) category has already entered a long-term decline (analogous with peak-to-trough decline of VHS and CD categories), caused by rapid growth in on-line streaming and a la carte rentals (though we admit that UV has been a bit of a disappointment, so far).

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