The daytime quality of light in forests varies with the density of the vegetation, the angle of the Sun, and the amount of cloud in the sky.

森林里的日光质量随着植被密度、太阳照射角度和天空云层数量变化而变化。

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On the fourth day, Icommanded the light to appear in the sky and I let the sun rule over the dayand the moon and stars rule during the night.

白天，让月亮与繁星支配夜晚。

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In another distant age, Icarus was the first human being who can fly in the sky, light and heat of the sun melted the wax on his wings, finally he drowned in the sea.

另一个遥远的时代，伊卡洛斯是第一位飞向天空的人类，但是他双翼上的蜡被太阳的光热融化，最终葬身大海。

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"I was smoking outside the door when I looked up at the sky and suddenly the sky lit up with a bright light and something that looked like the sun fell somewhere to the south of Yekaterinburg, " wrote Sergei Bobunets, quoted by AFP news agency.

BBC: Russia meteor eyewitness: 'Something like the sun fell'

The sun is a pale smudge in the sky, a pinhole promise of light and warmth, as we lurch and bump across the frozen land in pursuit.

BBC: In Sweden, a long journey home

And the sky is blue, it says, because the sun produces white light which is made up of all the colours of the rainbow.

BBC: rainbow