In all 17 species, the commonest kind of light receptors were "rod" cells, which are highly sensitive to light and allow night vision but cannot tell colors apart, they found.
在所有17种鲨鱼中，最常见的感光细胞是“杆状”细胞，这种细胞对光线非常敏感，可以使鲨鱼具有夜视能力，但这种细胞无法分辨颜色。
Retinas use two main types of light-sensitive cells to allow animals to see: Rod cells help measure brightness, while various types of cone cells help distinguish colors.
动物主要借助网膜中的两类光感细胞获得视觉：视杆细胞帮助感知亮度，而种类众多的视锥细胞则帮助辨别颜色。
It is shown that the resonant frequency of the composite system is sensitive to the alteration of the geometrical dimensions of tool rod with the wears in processing.
结果表明，随着加工过程中工具杆不断磨损，其长度和直径变化对系统共振频率影响明显。
It is shown that the resonant frequency of the composite system is sensitive to the alteration of the geometrical dimensions of tool rod with the wears in processing.
结果表明，随着加工过程中工具杆不断磨损，其长度和直径变化对系统共振频率影响明显。
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