可以把太阳光聚焦在焦面内，形成面枳大小不同和亮度不同的焦斑。
Can focus sunlight in the focal plane, the formation area of different sizes and brightness of different focal spot.
实验中所采用的不同颜色在色度、亮度以及浓度方面均保持一致。 这样，可以保证参与者的表现不受颜色的其他属性影响。
The colors in the study were precisely equated in hue, brightness, and chroma (intensity) to insure that reactions were not attributable to these other qualities of color.
在17种鲨鱼的视网膜中，最常见的感光体是视杆细胞，这意味着鲨鱼在不同的亮度环境下都可以看得到外界。
Rod cells were the most common types of photoreceptor found in all 17 shark species, which means the predators should be able to see within a wide range of light levels.
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