现在来谈谈闪光灯补光，补光是指当你在户外，阳光是主要光源时，闪光灯用来照亮阳光给人物带来的阴影等影响(如兔眼等)。
Fill flash is when you are outdoors for example and the light you are getting from the sun is the main light. Fill flash is just that.
到19世纪中叶的时候，科学家对被称为电磁力这一现象中三个组成部分(指电、磁和光，译者注)已经有了相当的了解。
By the mid-19th century scientists had a fair understanding of each of the three components of electromagnetism, as the phenomenon has come to be called.
叶黄素循环是指玉米黄质、花药黄质和紫黄质类之间的相互转换，它在高等植物光保护过程中发挥了重要作用。
The xanthophylls cycle refers to the conversion among zeaxanthin, antheraxanthin and violaxanthin, which plays a significant role in plant photoprotection process.
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