In other words, energy comes out when light goes in.
也就是说，光照进去，能量出来。
A gravitational lens is formed when light is bent by a massive object.
引力透镜现象就是光被巨大质量物体弯曲的现象。
Your body is hardwired to wake up when light is bright and go to sleep when it gets dark.
身体的清醒度与光线息息相关，当天亮了我们会醒来，反之我们就会想睡觉。
Double arcs happen when light is reflected more than once in an atmospheric water droplet.
双重彩虹的产生是由于光线不止一次地被大气中的水滴所反射。
We see shapes when light hits an object.
当光照射到一个物体时，我们可以看到物体形状。
Normal rainbows form when light refracts through raindrops, mist, or sometimes even sea spray.
正常的彩虹是由于光通过雨水，雾气，有时甚至海浪的折射所形成。
The sun and stars are daily proof of the great energy released when light atomic nuclei join together.
太阳和星星就是日常生活中轻原子核结合时释放的巨大能量的证明。
The sun and stars are daily proof of the great energy released when light atomic nuclei join together .
太阳和星星就是日常生活中轻原子核结合时释放的巨大能量的证明。
Redshift refers to what happens when light seen coming from an object is proportionally shifted to appear more red.
红移是指当一个天体发出的光线看起来成比例地更偏向红色。
The fiber is internally reflective at specific points, so that when light is sent along the fiber, some of it bounces back to a detector.
在特定点上，纤维可以向内反射光线，当光线沿纤维传输时，部分会反射到探测器上。
Like a rainbow, its daylight equivalent, a moonbow is produced when light is broken up into its constituent colours as it passes through water droplets.
月虹与白天出现的彩虹一样，是光通过水滴分解成多种色光后产生的，而光本身是由多种色光组成的。
Color is the sensation that is invoked when light of wavelengths between 360nm and 720nm hits our eyes and then is processed by our visual system [3].
颜色是360nm至720nm之间的光波刺激人类的眼睛并由视觉系统[3]进行处理后所触发的感知。
By measuring the photon signatures left when light bounces off photosynthesizing cells, astronomers may soon have a new tool for detecting extraterrestrial organisms.
通过测量光线从光合作用细胞反射后遗留下来的光子标记，天文学家们可能很快就能拥有一种新的探测外星生命的工具了。
The reaction of amino acids and silver is a thermal spontaneous process without additional energy. But when light introduced into the system the reaction speed will be changed.
氨基酸与银的反应是一个不借外加能量热力学上即可进行的过程，但当引入光之后，可改变反应速率。
The gravitational lens equations account for all the variables such as distance and density, and provide a better idea of when light left the background galaxy and how far it traveled.
引力透镜公式计算所有的变量，比如距离和密度，对光何时离开背景星系以及行走了多远的距离给出更好答案。
This extension of the photoelectric effect, in which one photon knocks one electron off the edge of an atom, could make physicists reconsider when light is a wave and when it's a particle.
在这种光电效应的延伸中，一个光子从原子的边缘打出一个电子，这可能要使物理学家们重新考虑光在什么情况下是波，什么情况下是粒子。
When light comes, darkness goes away.
光来了，黑暗就逃跑了。
When light hits a piece of silicon, it knocks out electrons.
当光照射到一片硅时，硅表面逸出电子。
When light is focused even more as a laser beam, it can cut through steel.
当光被集中成为雷射线时，连钢铁都能穿透切断。
When light passes through substances, including air, its speed is slowed down.
光穿过包括空气在内的物体时，它的速度减慢。
When light enters water, its intensity quickly decreases and its color changes.
当光线进入水中，它的强度迅速降低，其颜色亦发生变化。
When light is absorbed it alters the arrangement of electrons in the absorbing molecule.
当吸收光能后，就会改变吸收分子中电子的排列。
When light hits you from above, it creates shadows on your face, particularly under the eyes.
当光线从上方往下照时，会在脸上投下阴影，特别是在眼睛下方。
When light hits an object, it bounces off the surface and into the naked eye, making it visible.
当光线照射物体，物体表面反射光线到肉眼，使物体能被看见。
When light from a single direction (e.g. our sun) hits an object, part of the object is in shadow.
当单一光源例如太阳照到某个物体上，物体的一部分会处于阴影中。
'Tis heard in spring When light and sunbeams, warm and kind, On angel's wing Bring love and music to the mind.
春日闻知音阳光暖人心，天使振翅飞带来爱之音。
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