The system is heavily reliant on the availability of sunlight, and for critical tasks or areas a back-up artificial light source is required.
此系统对阳光有很强的依赖性，对于一些极端的工程或地区，需备有备用人工光源。
Aided by the two virtual images of the seam light source on the seam plane observed at the back of the prism, it can reach the systematic coaxis by regulating them to symmetrize the seam.
本文借助于在棱镜后面所观察到的在缝平面上的缝光源之二虚像，并通过把它们调至对缝严格对称，迅速达到系统的共轴要求。
Hair lights up like crazy when it's back-lit, so if hair is a big part of your subject make it stand out by placing your subject between you and a light source.
当背光的时候头发会发亮，因此，如果头发是你的重要组成部分的主题，把你的主题摆放在你和光源之间将它突出。
To do this, they first worked out what the background light looked like, and then shone a similar pattern back at the light source.
为了这个目的，他们首先弄清楚背景光的模样，然后在光源发射一个类似的光。
Now we can add a light source (I chose from the top right) for this image so later on we can have some dynamic light effect. To do this, go back to the background layer and duplicate it once more.
现在我们来为图片增加光源(我选的是右上方)，这样我们会有一些动感光线效果。
The light seems to be shining on the figures from the back, yet it is difficult to identify the source.
因为人物面上仿如遗传的色斑，似乎因受光而更为明亮、突出；
The light source for back light assembly includes red LED, green LED, blue LED, diffusor, support member and reflecting plate.
一种背光模块的光源，包括红光发光二极管、绿光发光二极管、蓝光发光二极管、扩散装置、支撑构件以及反射片。
The axes of the light rays from the light source (1) and the back-scattering to the light detector (3) have mutually closely adjacent and substantially parallel or coincident portions.
来自光源（1）的光线的轴线以及反向 散射到光检测器（3）的光线的轴线具有彼此紧邻并基本平行或重合的 部分。
The axes of the light rays from the light source (1) and the back-scattering to the light detector (3) have mutually closely adjacent and substantially parallel or coincident portions.
来自光源（1）的光线的轴线以及反向 散射到光检测器（3）的光线的轴线具有彼此紧邻并基本平行或重合的 部分。
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