back lighting light source system 背面照明光源系统
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。
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