If life exists, scientists expect the planet's rays to be embedded with tell-tale chemical fingerprints of atmospheric molecules, such as oxygen and methane.

如果生命存在，科学家们希望这个行星上的光线能够嵌入大气层分子的化学指纹位移指示器，像氧气、甲烷一类的气体。

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The ultra violet (UV) rays that cause suntans also cause a kind of chemical, called endorphins, to be released into the blood.

造成皮肤晒黑的紫外线，也会造成一种称为脑内啡的化学物质被释放进血液中。

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The other device can detect the distinctive gamma rays produced by collisions of neutrons with the atoms of different chemical elements.

另一台设备，探测中子与不同化学分子碰撞后产生的不同伽马射线。

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UTC's solution: Pass the return air through an aluminum filter sprayed with titanium dioxide that, hit with ultraviolet rays, sets off a chemical reaction that breaks down nasty organic compounds like benzene and formaldehyde into carbon dioxide and water.

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Chemical filters largely work by absorbing the sun's rays.

WSJ: European Sunscreen Roadblock on U.S. Beaches