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.

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。

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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.

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。

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