从已灭绝的复活节岛棕榈坚果的考古发现中可以看到由波利尼西亚老鼠的牙齿形成的小凹槽。
Archaeological finds of nuts from the extinct Easter Island palm show tiny grooves, made by the teeth of Polynesian rats.
例如，彼得·谢尔登对于三叶虫的研究，那是一种已灭绝的身体分节的海洋生物，他的研究让我们得以一窥三百万年以来一个海洋环境的进化过程。
For example, Peter Sheldon' s studies of trilobites, a now extinct marine animal with a segmented body, offer a detailed glimpse into three million years of evolution in one marine environment.
每一个小厕间都代表了新西兰北部岛屿濒临灭绝或已灭绝的鸟类。
Each cubicle represents an endangered or extinct bird from New Zealand's North Island.
在生物进化框架中，体质人类学和现存的及已灭绝的物种有密切关系。
In the framework of biological evolution, physical anthropology and the existing and extinct species closely related.
据研究者说，他们还首次完成了已灭绝的美洲乳齿象细胞核DNA序列的测定。
The researchers also made what they say are the first sequences of nuclear DNA from the extinct American mastodon.
一种已灭绝的始新世和更新世的有蹄哺乳动物，其特征为有三爪，每爪有三趾。
Any of various extinct ungulate mammals of the Eocene to Pleistocene epochs, having distinctive three-clawed, three-toed feet.
恐龙研究专家认为，现代鸟类直接起源于手盗龙类，其他已灭绝的恐龙现在被称之为“非鸟恐龙”。
Modern birds are direct descendants of Maniraptoran dinosaurs, experts say. The creatures that went extinct millions of years ago are now called "non-avian dinosaurs."
除了动物——包括现存的和已灭绝的——研究者们还发现了现代发明的图像，如自行车、飞机和汽车。
In addition to animals — living and extinct — researchers found images of modern inventions such as bicycles, planes and cars.
任一种小型已灭绝的翼龙目的飞行爬行动物，它们绝大多数都没有尾巴，生活在侏罗纪和白垩纪之间的那段时期。
Any of various small, mostly tailless, extinct flying reptiles of the order Pterosauria that existed during the Jurassic and Cretaceous periods.
达尔文和华莱士的物竞天择理论都蕴含一个主要的观点：即所有现存和已灭绝的生命形式都起源于同一个共同的祖先。
A major implication of Darwin and Wallace's theory of natural selection is that all life forms, living and extinct, are descended from a single common ancestor.
许多业已灭绝的物种，或许大多数已灭绝的物种，是由于自然原因而非人类干扰的原因而灭绝，这一点肯定无人质疑。
Certainly no one can argue that many, and perhaps most, extinct species became extinct naturally rather than due to human interference.
古生物学专业研究化石和学习已灭绝的生物物种。课程包括化石的形成和化学，植物化石，实地和实验室的研究方法等。
Paleontology majors study fossils and learn about extinct life forms. Topics of study include fossil formation and chemistry, fossil plants, methods of research in the field and lab, and more.
草原象和森林象已经分开了至少3百万年，研究者表示，就像亚洲象和已灭绝的长毛猛犸象一样，彼此成为完全不同的物种。
Savannah and forest elephants have been separated for at least three million years, they say, and are as distinct from each other as Asian elephants are from the extinct woolly mammoth.
我们还利用新技术检测了各类蛋壳化石，包括已灭绝的摩亚、象鸟以及19000年前的鸸鹋蛋壳，并从中获取了DNA签名。
Using new techniques we obtain DNA signatures from a variety of fossil eggshells, including the extinct moa and elephant birds and 19, 000-year-old old emu.
Naish指出，关于Samrukia的新发现证明了现代鸟类与已灭绝的中生代鸟类种群的不同程度并非像人们曾认为的那样。
As Naish points out, though, the new findings about Samrukia demonstrate that modern birds "weren't as distinct from extinct groups of Mesozoic birds as people used to think."
两位神经科学家表示，一个有着大眼睛、娃娃脸、平均智商达到150的已灭绝的人种，可能已经将他们的基因融合在了现代人种中。
Two neuroscientists say that a now-extinct race of humans had big eyes, child-like faces, and an average intelligence of around 150, making them geniuses among Homo sapiens.
在一项非同寻常的“侏罗纪公园”(Jurassic park)式的实验中，已灭绝的巨型猛犸象的一个冰冻标本的DNA被用于再造它们的血液。
In an extraordinary Jurassic Park - style experiment, DNA from a frozen specimen of the extinct giant was used to reproduce their blood.
在2006年的另一探险考察中，地质学者发现了另一种已灭绝的哺乳动物——一种被称作Duchesneodus uintensis （爵妇新兽）的雷兽——的部分头骨。
On another expedition in 2006, the geologists found a portion of the skull of another extinct mammal, a brontothere known as Duchesneodus uintensis.
居住在山区的大猩猩已濒临灭绝。
科学家正试图把已灭绝动物的特征与现存类似动物相比较。
Scientists are attempting to compare features of extinct animals with living analogues.
即使新的种群属于不同物种，它也可以大致填补已灭绝种群空出的生态位，保持食物网的完整。
Even if the new population is of a different species, it can approximately fill the niche vacated by the extinct population and keep the food web intact.
事实上，大多数分析家认为某种环境退化是许多已灭绝鲑鱼种群消亡的根源。
Indeed, most analysts believe that some kind of environmental degradation underlies the demise of many extinct salmon populations.
作为已灭绝物种或人类种族，尼安德特人与旧石器时代中期的工具有关。
An extinct species or race of human beings, Homo neanderthalensis, associated with Middle Paleolithic tools.
自然保护国际联盟估计全世界已认定的47677个物种中有约17300个物种濒临灭绝。
The IUCN estimates that nearly 17, 300 of the world's 47, 677 assessed species are under threat of extinction.
特别地，被猎杀至近乎灭绝的一种羚羊——阿拉伯羚羊，现在野生数量已超过1000只。
And one antelope in particular, the Arabian Oryx, which was hunted to near extinction, now has a wild population of over 1,000.
这被牛津的研究人员用511个不同的例子证明了，它们的范围从已灭绝动物的化石到现存的例子都有。
This was verified by the Oxford researchers using 511 different samples ranging from extinct species only available as fossils, up through current living examples.
化石记录向人们出示了已灭绝物种存在过的证据。
The fossil record showed evidence of life forms that no longer existed.
通过比较腐鱼与化石的照片，研究人员能猜测出已灭绝物种的形状。
By comparing photos of rotting fish to fossils, researchers can guess what the extinct creature looked like.
看到白暨豚的可能性不大，因为此前已经推测这种动物已几乎灭绝了。
The chance of seeing the baiji is overshadowed by the foregone conclusion it's nearly extinct.
看到白暨豚的可能性不大，因为此前已经推测这种动物已几乎灭绝了。
The chance of seeing the baiji is overshadowed by the foregone conclusion it's nearly extinct.
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