首句一看就知道这段是讲触觉,touch, 并且发现有个but转折,在转折前说触觉有时被描述为很弱的,转折后说这是错误的,表明这段后面要具体证明这一观点。最后一句也是在具体讲解触觉这个感官。
Paragraph3:
The sense of vision is developed to different degrees in different species. Baleen species studied at close quarters underwater-specifically a grey whale calf in captivity for a year, and free-ranging right whales and humpback whales studied and filmed off Argentina and Hawaii-have obviously tracked objects with vision underwater, and they can apparently see moderately well both in water and in air. However, the position of the eyes so restricts and field of vision in baleen whales that they probably do not have stereoscopic vision.
读首句就可看出这段讲的是视觉。最后一句提到了baleen whales的眼睛位置限制了它们的视觉域,they probably do not have stereoscopic vision.
Paragraph4:
On the other hand, the position of the eyes in most dolphins and porpoises suggests that they have stereoscopic vision forward and downward. Eye position in freshwater dolphins, which often swim on their side or upside down while feeding, suggests that what vision they have is stereoscopic forward and upward. By comparison, the bottlenose dolphin has extremely keen vision in water. Judging from the way it watches and tracks airborne flying fish, it can apparently see fairly well through the air-water interface as well. And although preliminary experimental evidence suggests that their in-air vision is poor, the accuracy with which dolphins leap high to take small fish out of a trainers hand provides anecdotal evidence to the contrary.
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