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。
Surfers are very common in California, and when a shark attack occurs there, it's usually because to a shark, a surfer looks like a seal-one of their common food sources-riding a wave.
在加利福尼亚随处可见冲浪者，如果鲨鱼在那袭击人通常是由于它把冲浪者看成一只在冲浪的海豹了—海豹是它们基本的食物来源。
Most common gray shark along coasts of middle Atlantic states; sluggish and occasionally caught by fishermen.
大多生活在大西洋中部海岸地区的普通灰色鲨鱼；行动迟缓，偶尔被渔民捕获。
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