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。

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。

The progress of the study on molecular phylogeny of cetaceans was reviewed.

综述了近年来鲸类分子系统学的研究进展。

A notable exception are the cetaceans, which we all know as dolphins and whales.

有一个显著的例外是鲸类动物，像我们知道的海豚和鲸。

It should be obvious that cetaceans—whales, porpoises, and dolphins—are mammals.

众所周知，鲸类动物是哺乳动物，如鲸鱼、鼠海豚和海豚。