The skull also lacks a blowhole, another cetacean adaptation for diving.

颅骨上缺少一个可以进行适应性潜水排气孔。

At new risk are cetaceans like the North Atlantic right whales.

对北大西洋露脊鲸这类鲸目科动物来讲同样面临着这种新致命危险。

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

这项非常令人兴奋发终于使科学家们能够重建鲸目动物最有可能。

I'm from Mystic Aquarium in Mystic, Connecticut. I'm a trainer of cetaceans and pinnipeds there.

我来自康涅狄格州神秘水族馆。我一名鲸目动物和鳍足类动物教练。

It is one of the earliest whales and the oldest cetacean discovered that had functional legs.

它最早发鲸目动物之一，也最早发有腿鲸目动物。

Roughly speaking, these animals filled the ecological niches now occupied by toothed cetaceans such as dolphins and killer whales.

大致上讲，这些动物填补了由鲸目动物海豚和虎鲸所占据生态龛位。

Our frigate drew nearer to the cetacean. I examined it with a completely open mind.

我们战舰埃近了这个鲸鱼类动物。

What can be this cetacean, which neither Cuvier nor Blumenbach knew anything about?

居维叶和布鲁门巴赫都不知道这只鲸类动物到底什么？

Every cetacean known to man is endangered.

任何人类已知鲸类动物。

The venture cetaceans can be divided into three big subspecies, each typified by big-name investors.

创业鲸类可分为三大亚种，各以大牌投资人为表。

Ichthyosaurs also resembled cetaceans in another way: unlike most living reptiles, which lay eggs, they gave birth to live young.

大多数存爬行动物靠产卵繁殖，而鱼龙通过怀胎产子。

If saving cetacean species from extinction.

如果依靠国际捕鲸委员会。

Like other aquatic mammals, such as dolphins and porpoises, this wolf-sized animal, known as Pakicetus, is part of the cetacean group.

像其他水生哺乳动物，如海豚和鼠海豚一样，这种体型像狼一样大小动物被称为巴基斯坦古鲸，鲸类一员。

If it was a cetacean, it exceeded in bulk any whale previously classified by science.

如果它鲸类动物，那么它体积就超过了之前科学分类任何鲸鱼。

Some very early cetaceans have this ankle bone, too, which tells us that cetaceans evolved from artiodactyls.

一些非常早期鲸类动物也有这种踝骨，这告诉我们鲸类动物从偶蹄类进化而来。

The cetacean had rammed our frigate at about eleven o'clock in the evening.

战舰跟那鲸鱼冲撞时间在夜间十一点钟左右。

No argument, sir, since our craft breathes in the manner favored by cetaceans.

那不用说，先生，因为我们船跟鲸鱼类一般呼吸。

And elephants, cetaceans, parrots and some rodents are suspected of it, though so far the evidence concerning them is anecdotal.

大象、鲸类动物、鹦鹉和一些啮动物被怀疑与它有关，尽管到目前为止有关它们证据都轶事。

Like a cetacean's tail, its propeller churned the waves slowly.

它推进器像鲸鱼类尾巴一般，慢慢地冲开海浪。

The authorities in Australia say a further 200 whales have become stranded off Tasmania, taking the total number of beached cetaceans to 470.

澳大利亚当局表示，又有200头鲸鱼在塔斯马尼亚搁浅，使搁浅鲸类总数达到470头。