首句有on the other hand表转折,说明要和上段有联系,接着往后看又说到了眼睛的位置,这次说的是most dolphins and porpoises, they are not like the baleen whales, they have stereoscopic vision forward and downward.
Paragraph5:
Such variation can no doubt be explained with reference to the habitats in which individual species have developed. For example, vision is obviously more useful to species inhabiting clear open waters than to those living in turbid rivers and flooded plains. The South American boutu and Chinese beiji, for instance, appear to have very limited vision, and the Indian susus are blind, their eyes reduced to slits that probably allow them to sense only the direction and intensity of light.
首句一读的话会发现一个重要的词汇habitats. 在这句之后又有了for example, 同时看到了vision, 说明这段讲vision和habitats的关系。
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