The light they saw in the sky might have been light from the ground, reflected on to the clouds.

他们在天空中看到的光可能是来自地面反射到云层上的光。

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Above a scorched plain outside Seville, Spain, reflected sunlight reflects again off low clouds.

西班牙的塞维利亚灼热的平原，反射太阳光再次穿过低云。

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By measuring changes in the light reflected from the clouds, they found that the clouds appear to wax and wane in prevalence over a 27-day cycle.

通过测量夜光云反射的光的变化，他们发现夜光云从盛到衰的周期大约为27天。

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Solar energy can, of course, be gathered on Earth, but only about half of the sun's radiation ever makes it to the Earth's surface--the rest is either absorbed by the atmosphere or reflected back by clouds.

FORBES: Galactic Gold Mine?

It was a still afternoon, and billowy white clouds were reflected in the water.

NEWYORKER: Unconventional Crude

He could detect shallower water by colour, and see the light of invisible lagoons reflected in the undersides of clouds.

ECONOMIST: Mau Piailug