The calotype was revolutionary in its use of chemically treated paper in which areas hit by light became dark in tone, producing a negative image.

卡罗摄影法对化学处理纸的使用是革命性的，其中光照区域色调变暗，形成负像。

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Atoms and molecules above 50 kilometers in the atmosphere are excited by sunlight during the day, and then release this energy at night, producing primarily green light that is observable from orbit.

白天，50千米以上的大气层中原子和分子吸收太阳光的能量，夜晚又将这些能量释放出来，主要产生出我们从轨道上看到的绿色光。

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Most of the time the lasers are dark, producing areas of light with low intensities with the occasionally brief but brilliant flashes of high - intensity light.

大部分的时间里激光是暗的，产生低强度的光区伴随着偶尔短暂的高强度光的闪烁。

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Previous research found that the shark has light-producing cells called photophores in its belly, and it uses this light to camouflage itself.

BBC: Glowing shark scares off predators with 'lightsabers'

Most existing DNA sequencers (including the 454 machine) do their reading by attaching light-producing molecules to DNA, taking pictures and analyzing the resulting image.

FORBES: Magazine Article

The average Aequoria Victoria is three to four inches wide and shaped like an umbrella, with 100 light-producing organs the size of poppy seeds spaced on its outer rim.

FORBES: Magazine Article