Boundary clay layers are used by scientists to determine the rate at which an extinct species declined.
边界粘土层被科学家用来确定一个灭绝物种衰落的速度。
An extinct species or race of human beings, Homo neanderthalensis, associated with Middle Paleolithic tools.
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。
If you want a list of Ron Artest 'enemies, just check the extinct species list.
假如你要阿泰敌人的列表，那就往查已灭尽物种列表。
Australopithecus, Cro-Magnon, Neanderthal are to name but three extinct species.
南方古猿人、克罗·马尼翁人、尼安得特尔人是三种灭绝物种的名字。
Tentative attempts to use cloning to bring back extinct species are already under way.
用克隆手段来使灭绝动物重新回到世界上的尝试工作已经开始。
A technology used to develop new medical treatments might one day revive endangered or extinct species.
科学技术常常能带来新的医学疗法，有一天这些新疗法可能会拯救濒危物种，甚至重现灭绝的物种。
The breakage frequencies in the extinct species were strikingly higher than those in the present-day species.
这些已灭绝物种的牙齿破损发生率要明显高于现存物种。
Dr Manning said: "the potential for this technique to gently un-pick the chemistry of long extinct species is quite breathtaking."
Manning博士说：“这项技术对于分析已灭绝动物化学特性的潜力是十分巨大的。”
Certainly no one can argue that many, and perhaps most, extinct species became extinct naturally rather than due to human interference.
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。
No sooner had she finished watching that programme about those extinct species, than she decided to join the Wildlife Conservation Organization.
她一看完那个关于已灭绝物种的电视节目，就立志加入野生动物保护组织。
This was verified by the Oxford researchers using 511 different samples ranging from extinct species only available as fossils, up through current living examples.
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。
An extinct species or race of human beings, Homo neanderthalensis, living during the late Pleistocene Age in the Old World and associated with Middle Paleolithic tools.
尼安德特人：已灭绝的人类类型或种族尼安德特人，生存于太古时代更新世的晚期，与旧石器时代的工具有联系。
The success of this technology and improve the quality of poultry for the vegetative propagation of rare and endangered animals, extinct species of great significance Chuan.
这一技术的成功与完善对于优良家禽的无性繁殖和濒临绝迹的珍贵动物的传种意义重大。
They rejected preservational bias because a total absence of breakage in two extinct species demonstrated that the fractures were not the result of abrasion within the pits.
他们不同意保存错误，因为两个完全没有牙齿破裂的物种证明了断裂不是由坑内磨损引起。
"If the atmosphere filled up with nitrogen, mankind would not survive," she continued, as we inspected an extinct species of bird. "that does not mean that mankind deserved to die."
“如果大气中充满氮气时，人类是无法生存的，”当我们在考察一个灭绝的鸟类物种的时候，她接着说：“这并不意味着人类该死。”
Cases in which many species become extinct within a geologically short interval of time are called mass extinctions.
许多物种在地质上很短的时间间隔内灭绝的情况称为大灭绝。
Geigl and her colleagues looked at 3200-year-old fossil bones belonging to a single individual of an extinct cattle species called an aurochs.
盖格尔和她的同事们研究了3200年前的骨头化石，这些骨头属于一种已经灭绝的叫做欧洲野牛的种类。
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.
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。
They will tum out to be the second-largest species of birds to become extinct.
它们将成为第二大灭绝的鸟类。
Gause performed numerous tow-species experiments in the laboratory, in which one of the species became extinct when only a single kind of resource was available.
高斯在实验室里进行了许多双物种实验，其中一个物种在只有一种单一资源的情况下就灭绝了。
When a species goes extinct, it dramatically changes the landscape of biodiversity.
当一个物种灭绝时，它会极大地改变生物多样性的状况。
Whatever the cause, dinosaurs, as well as about half of all species on the planet, went extinct.
不管什么原因，恐龙以及地球上几乎半数以上的物种灭绝了。
This break in Earth's history is marked by a mass extinction, when as many as half the species on the planet became extinct.
地球历史上的这次重大灾难以物种的大量消亡为标志；当时，地球上多达一半的物种都灭绝了。
Thanks to natural selection, most species that have ever lived has already gone extinct, so this is not a new phenomenon.
由于自然选择，大多数曾经存在过的物种已经灭绝，所以这不是一个新现象。
Humans arrived in the Kaliko Islands about 7,000 years ago, and within 3,000 years most of the large mammal species that had lived in the forests of the Kaliko Islands were extinct.
人类大约在7000年前到达加里科群岛，在3000年内，生活在加里科群岛森林中的大型哺乳动物物种大部分灭绝。
Meteorite impacts can be advantageous for some species, which thrive, and disastrous for other species, which become extinct.
陨石的撞击对某些物种是有利的，它们会茁壮成长；而对其他物种则是灾难性的，它们会灭绝。
The Russian biologist G. F. Gause performed numerous tow-species experiments in the laboratory, in which one of the species became extinct when only a single kind of resource was available.
俄罗斯生物学家G. F.Gause在试验室进行了大量的两个物种的实验，试验中，当只有单一的资源时，其中一个物种将会灭绝。
The extinctions differ from species to species, and we don't find any common genetic characteristic to distinguish extinct from surviving species.
各个物种的灭绝原因都不相同，而且找不到任何遗传特性来区别灭绝物种与存活物种。
More to the point, 480 of the 492 species made extinct since Roman times have disappeared in the past two centuries.
说得更具体点，从古罗马时代以来，在过去的两个世纪里，492个品种中已经有480种灭绝了。
A mission aimed at rediscovering amphibian species thought to be extinct has yielded its first results.
一个旨在重新发现被认为灭绝的两栖物种的代表团收获了其第一个发现。
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