Those in the dark are in no position to light the way for others.; Persons in the dark cannot light the way for others.

以其昏昏， 使人昭昭是不行的。

《新英汉大辞典》

The seven volunteers spent a month with the implants and reported being able to distinguish between dark walls and a light window, and a dark table and white plates.

七个志愿者花了一个月的时间进行植入手术，然后报告已经可以分辨出较暗的墙和较量的窗户，也能分辨出黑色的桌子和白色的盘子。

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In rooms with a good deal of ambient light, a screen image with a dark background and light text tends to washout, but dark text on a light background will maintain its visual intensity a bit better.

在光线明亮的房间里，深色背景和浅色文本搭配的屏幕图像容易泛光，但是浅色背景搭配深色文本的视觉效果就好得多。

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In "Family of Man," a dark-haired, light-eyed woman with a bright blue head covering looks intensely at something hidden from view.

VOA: special.2009.11.20

First,they don't meet in the daytime; they meet either early before light,at dawn, or after dark,at night.

首先，他们不在白天聚会;,要么在天亮前的黎明，要么在天黑后的夜晚。

耶鲁公开课 - 新约课程节选

That's because it's here where the rigid polarities between light and dark and good and evil, all of these absolute oppositions, begin to collapse.

这是因为这里就是光与暗,善与恶之间严格的两极分化，及所有绝对的对比开始崩塌的地方。

耶鲁公开课 - 弥尔顿课程节选

Due to the limited number of electrodes, patients would only be able to discern light or dark, but most have reported better functionality with the device -- being able to make out the shape of a curb while walking, or discerning between light, grey or dark colored socks, for instance.

ENGADGET

What's exceptional is the orchestration of color, form, light and dark (lots of dark), 3-D technology and digital effects into a look that amounts to a vision.

WSJ: Dredd 3D | How to Survive a Plague | End of Watch | Trouble With the Curve | Vivid Dredd 3D Makes Rival Thrillers Look Flat | Film Reviews by Joe Morgenstern

Roxanne takes two similar looking bracelets, both containing varying shades of light and dark green.

BBC: How to buy jade in Asia