Time of day. Brightness of the sun.

一天中的时段，阳光的强度。

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The brightness of the sun cheered him up.

太阳的光辉使他心情好了起来。

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Better by far to promise one candle and deliver two than to promise all the brightness of the sun and deliver only darkness.

在黑暗中，与其许诺给予所有阳光，远不如只承诺一支蜡烛而送上两支。

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Scientists say small changes in the sun's brightness can produce effects on Earth similar to two weather events in warm waters of the Pacific Ocean.

VOA: special.2009.09.29

But there is a way to counter the increasing brightness of the Sun, the scientists believe - just increase the radius of the Earth's orbit!

BBC: Blue Marble Nasa

The transit of Venus can't be observed with the Hubble Space Telescope because the extreme brightness of the sun would destroy the telescope and its instruments.

CNN: A transit of Venus, an age of wondrous science

The EX-G1 includes additional BEST SHOT settings suitable for various outdoor situations, such as "snow" and "beach" scene settings, which automatically adjust to prevent subject underexposure due to the brightness of snow or sun.

ENGADGET: Casio trots out world's slimmest shock-resistant digicam: EX-G1 (video)