Evolution can explain why human embryos look like gilled fishes . 进化论能够解释为什么人类的胚胎看起来象除去了内脏的鱼一样。
2.
Beluga whales , pacific white - sided dolphins , harbor seals , sea otters and penguins are among the world s largest assortment of finned , gilled , and other aquatic creatures that swim within the marble - clad confines of the shedd aquarium 北冰洋的白鲸，太平洋的白鳍豚，海豹，海獭，企鹅等鳍类鳃类以及其他水族动物在谢德水族馆内的大理石水池中畅游着，其种类之多在世界上也屈指可数。
