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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 so when you actually have a device the bits don't flow at the speed of light in reality.

因此，当你拥有一个设备,数据位并不能以现实中的光速传输。

哈佛公开课 - 计算机科学课程节选

When you want to know if something is transparent to visible light or not, here is the mystery material and here is visible light.

而我们知道,物体是否对可见光透明，这里是神秘的材料，这里是可见光。

麻省理工公开课 - 固态化学导论课程节选

When light is in a wave form, it is subject to interference and disruption, often in predictable ways.

FORBES: Trick Of The Light

Thursday's Senate confirmation hearing will be, in popular mythology at least, a brief moment when light flashes into the darkness.

BBC: Drones at the forefront of the Brennan hearing

When light travels through glass, it slows down (the amount it slows is measured by a number called the refractive index).

ECONOMIST: A way to detect Earth-sized planets around other stars