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1·Extinct but already fully marine cetaceans are known from the fossil record.

从化石记录中可以了解到一些已经灭绝、但已经完全变成海洋生物的鲸目动物。

2·The whale retained a tail and lacked a fluke, the major means of locomotion in modern cetaceans.

这种鲸保留了尾巴，没有现代水生鲸类动物用于行动的主要部位，尾片。

3·Although limited to a skull, the Pakicetus fossil provides precious details on the origins of cetaceans.

虽然只有一个头骨，但帕基塞图斯化石提供了有关鲸类起源的珍贵细节。

4·The fossil consists of a complete skull of an archaeocyte, an extinct group of ancestors of modern cetaceans.

“巴基鲸”化石由一个原细胞的完整头盖骨所组成，这是现代鲸类祖先中已经灭绝的一个物种。

5·Missing until recently were fossils clearly intermediate, or transitional, between land mammals and cetaceans.

直到最近才发现的化石，显然是介于陆地哺乳动物和鲸类之间的过渡物种。

6·Very exciting discoveries have finally allowed scientists to reconstruct the most likely origins of cetaceans.

最终，科学家们通过一些非常令人振奋的发现，复原了最接近其原貌的鲸类动物的样子。

7·Other features, however, show experts that Pakicetus is a transitional form between a group of extinct flesh-eating mammals, the mesonychids, and cetaceans.

然而，专家认为巴基鲸是已经灭绝的食肉哺乳动物中爪类和鲸类之间的过渡物种。

8·Cetaceans even surpass most primates in their use of sound.

鲸目动物的声音运用能力甚至超过大多数灵长类动物。

9·There are plenty of stories of cetaceans saving humans.

鲸类动物救人的故事有很多。

10·Basilosaurids are the extinct sister group to the crown cetaceans.

龙王鲸类是鲸类冠类群的绝灭姊妹群。

鲸目动物

1·They talk of whales and dolphins in terms of cultures and societies, and say cetaceans possess qualities of personhood.

他们用文化和社会术语来谈论鲸鱼和海豚，称鲸目动物拥有人格性品质。

2·Cetaceans even surpass most primates in their use of sound.

鲸目动物的声音运用能力甚至超过大多数灵长类动物。