The first consideration is contrast: links have to be dark (or light) enough to contrast with the background color.
第一要义就是差异(对比)：链接要足够暗(或者亮)以和背景色相对照。
It overcomes shortages of the traditional LLL night vision which can't work in the completely dark environment or the condition that the light is not enough.
此它利用激光辅助照明装置克服了传统的微光夜视仪在全黑天或光照度不足条件下无法工作等不足。
He told me the best time to take picture of fire playing would be at late afternoon, when there is enough light to see the person and surrounding, yet dark enough to show the brightness of fire.
俊俊说曾经有影会找过他表演拍照。但拍玩火不容易。拍照时间最好是黄昏，既够光看到面容，又够黑可以表现到火烈焰。
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