视觉系统可以探测到光亮和昏暗的模式，并且根据经验，大脑会创建一幅空间地图。

The visual system detects patterns of light and dark and, building on experience, the brain creates a spatial map.

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不能只是简单地把节能灯安装在白炽灯装置上，然后还指望它产生的视觉效果不仅仅是微弱、朦胧、昏暗的感觉。

A CFL cannot be simply installed in an incandescent fixture and then expected to produce a visual appearance that is more than washed out, foggy, and dim.

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而视觉上，一般来说，蝙蝠的视力在昏暗的光线下是最敏锐的；光线越亮，它们的视力就变得越差。

Bat vision is generally known to be sharpest in dim light, and to get worse the brighter it gets.

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