When stretched horizontally, the pupils allow for more light to enter from the front, back, and sides.

当瞳孔横向伸展的时候，更多的光能够从前面、后面和侧面进入。

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Turning back to the mirror, Jenny saw a flash of light from the watch in the glass.

回头照镜子， 珍妮发现手表发出了一束光。

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It has a lens system to focus light onto the film at the back of the camera.

它的镜片系统可以将光线聚焦到相机后部的胶片上。

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This gives them their color. However,when light travels from air to snow, some light is sent back,or reflected.

VOA: special.2010.01.05

And if we do, in fact, hit it with light to get the electrons off, it will go back to the straight up in position, or if it gets knocked hard enough it does that, too.

而且如果我们这么做，事实上，用光轰击它以逐出电子，它就会在原位置沿直线返回，或者如果它被撞击的足够猛烈,也会出现上述现象。

麻省理工公开课 - 化学原理课程节选

So, if you use a black lamp or something and you excite something up to a higher energy level and then it relaxes back down to its lower energy state, it's going to emit a new wavelength of light, which is going to be visible to you.

如果你用一个紫外灯或别的,东西把某种分子激发到,更高的能级，然后它会掉回,到低能级，它就会释放,一个新的波长的光,这个光是可见的。

麻省理工公开课 - 化学原理课程节选

So it's not the journey that's slowing things down, it's the conversion from electronic signal to light and light back to electronic signal.

CNN: Surfing at the speed of light

"The good news is that people who stay up late in front of the television and computer may be able to undo some of the harmful effects just by going back to a regular light-dark cycle and minimizing their exposure to artificial light at night, " Bedrosian says.

CNN: Unplug! Too much light at night may lead to depression

"I won the heavyweight title then came back to win the light-heavyweight title, " said Jones, a cockfighting and fishing enthusiast from the small town of Pensacola, Florida.

BBC: Jones out to prove his greatness