Light travels slower through water, glass, even air, than through a vacuum.

光在水、玻璃，甚至是空气中的传播速度比起在真空中慢得多。

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Because the crystal bends light much more strongly than air does, light should have bounced off the holes and traveled down a channel that had been left clear of holes.

由于晶体比空气更能弯曲光线，光会从小孔上反射回来，从而沿着没有小孔的通道传播。

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All this extra stuff in the air can make the sunset much redder than sunrise. It can also make the light more diffuse.

在空气中这些多余的物质使得日落的太阳比日出时显得更红，也使得光线更加的模糊。

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With a fuel burn 30% less than a typical light jet and a cruise speed of more than 345 mph, the King Air 250 really zips along.

FORBES: The Most Successful Aircraft Design Gets Even Better

What if a can of floor sealant mentioned the fellow who didn't realize that the fumes are heavier than air and can catch on a pilot light in the basement, and who died as a result?

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But a clear, cloudless day-time sky is blue because molecules in the air scatter blue light from the sun more easily than they do red light.

BBC: rainbow