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。
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。
There are plenty of stories of cetaceans saving humans.
鲸类动物救人的故事有很多。
There are plenty of stories of cetaceans saving humans.
鲸类动物救人的故事有很多。
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