然而，他们虽然仍呼吸着空气，却从未进化出类似于腮这种早期海洋生物的器官。
They do, however, still breathe air, having never developed anything equivalent to the gills of their earlier marine incarnation.
而在现实中研究人员是被禁止制造缺乏器官生长能力的人体胚胎，所以他们希望能用猪进行类似的实验。
In reality researchers are not allowed to create human embryos that lack the ability to grow organs and so they hope to do the same using pigs.
自然中的海洋生物没有类似的难题，因为它们有专门的器官来检测周围的环境。
Natural sea creatures do not experience such problems because they have special organs that enable them to sense their environment.
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