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。
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。
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。
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。
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。
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。
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。
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。
Similarly, although at least some cetaceans have taste buds, the nerves serving these have degenerated or are rudimentary.
同样，尽管有些鲸鱼也有味蕾，但这些味觉器官要么已经退化，要么就根本没有发育。
Remingtonocetids show evolution of balance organs and the sound transmission mechanism in the direction of modern cetaceans.
雷明顿鲸类的平衡觉器官和声音传导机制已经表现出向现代鲸类方向演化的趋势。
It is this essential mystery that leads us on in our conflicted attitude toward cetaceans, named for the Greek for sea monster.
正是这种神秘感将我们引向对鲸类的矛盾态度。希腊语中鲸鱼是海中怪兽的意思。
But if cetaceans can't take these tests, they have met one critical laboratory benchmark of higher cognition: self-recognition.
如果鲸目动物不能接受这些测试，那么它们就遇到了更高认知力的实验室指标：自身识别。
The findings might someday help rescuers test whether the lost cetaceans might be deaf before releasing them back into the wild.
也许有一天这个研究能帮助研究人员发现为什么一些被救助的鲸豚类生物在被放归大海前就失聪的原因。
Ichthyosaurs also resembled cetaceans in another way: unlike most living reptiles, which lay eggs, they gave birth to live young.
鱼龙和鲸类的另一点相似在于：不像其他目前存活的卵生爬行类，他们胎生生下后代。
Roughly speaking, these animals filled the ecological niches now occupied by toothed cetaceans such as dolphins and killer whales.
粗略地讲，这些动物在生态系统中所占的位置现在被海豚和杀手鲸一类的齿鲸类占据。
She had used the Force to communicate with the cetaceans of the Chadrian oceans, having a supernatural advantage in her ranching duties.
她用原力与查德海洋里的蔡尔克鲸交流，这使她的牧场工作有超自然的优势。
The method to extract genome DNA from old skeletal specimens of cetaceans was improved and the PCR amplification reaction was optimized.
改进了从鲸类陈旧骨骼标本中进行基因组dna提取和PCR扩增的方法。
She concluded, "Essentially, the brains of primates and cetaceans arrived at the same cognitive space while evolving along quite different paths."
她总结说，“灵长类动物和鲸类的大脑的认知能力基本上处在同一是水平，只是进化方式截然不同。”
Gingerich believes the first cetaceans probably resembled anthracotheres, svelte hippo-like browsers that inhabited swampy lowlands in Eocene times.
金格里奇相信第一批鲸和沼泽地碳兽十分相似，一种生活在始新世时期沼泽低地里，形似河马的小型食草动物。
Once shorewards of the breakers cetaceans and odontocetes could interpret relative quite as deeper water, and swim shorewards to their sad suicides.
一旦捕捉到向岸碎浪的轻响，海豚和齿鲸可能会由于那种相对的安静而误以为是深水区，并岸边游去，导致令人痛惜的自杀。
Some of the senses that we and other terrestrial mammals take for granted are either reduced or absent in cetaceans or fail to function well in water.
对我们人类以及其他的陆地哺乳动物来说，有些感官是与生俱来的，然而对于鲸鱼来讲，这些功能要么已经衰退或彻底消失，要么就无法在水中正常发挥作用。
Some of the senses that we and other terrestrial mammals take for granted are either reduced or absent in cetaceans or fail to function well in water.
当然我们和另外一些陆地上的哺乳动物的一些器官或减少，或与鲸鱼不同，或丢失在水中很好生存的功能。
Many animals also died from run-ins with ships, and others were killed when sandbars-a favorite hangout for cetaceans-were blasted for easier navigation.
许多动物还死于与船只的撞击，还有其他的动物在沙洲被炸毁(为了更方便船只航行)时丧命。沙洲是鲸类动物最喜欢的栖息地。
The International Whaling Commission has for years debated whether it should limit the hunting of small cetaceans like dolphins, but it's been deadlocked.
像大多数的捕鱼形式一样，捕猎海豚并不受任何国际组织的管控。国际捕鲸委员会已经讨论多年是否应该限制像海豚一样的小型鲸类的捕猎，但是现在仍然处于僵持状态。
Abstract the transition in the evolution of cetaceans from terrestrial life to a fully aquatic existence is one of the most enduring evolutionary mysteries.
摘要：在鲸类的演化历史中，由陆生动物转化成完全的水生动物的过程是一个由来已久的演化谜题。
And although it may well be too late for the Baiji, cetaceans receive more attention than less 'marketable' species, that are nonetheless, vital for a functioning ecosystem.
虽然对关切白鱀豚的存亡可能是太迟了，但是人们对关心鲸类的程度却超出了其他“不是销售热点”的物种。尽管如此，这对生态系统的功能还是至关重要的。
And although it may well be too late for the Baiji, cetaceans receive more attention than less 'marketable' species, that are nonetheless, vital for a functioning ecosystem.
虽然对关切白鱀豚的存亡可能是太迟了，但是人们对关心鲸类的程度却超出了其他“不是销售热点”的物种。尽管如此，这对生态系统的功能还是至关重要的。
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