当一个物种灭绝时，它会极大地改变生物多样性的状况。
When a species goes extinct, it dramatically changes the landscape of biodiversity.
一个物种一旦灭绝就永远消失了。
边界粘土层被科学家用来确定一个灭绝物种衰落的速度。
Boundary clay layers are used by scientists to determine the rate at which an extinct species declined.
它是控制竞争种群规模的因素之一，在极端情况下，它可能导致一个竞争物种的灭绝。
It is one of the factors controlling the size of competing populations, and in extreme cases it may lead to the extinction of one of the competing species.
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。
Thanks to natural selection, most species that have ever lived has already gone extinct, so this is not a new phenomenon.
随着二叠纪生命形式的衰退，它们达到了一个致命的临界点，物种最终走向了大灭绝。
As Permian life-forms declined, they reached a fatal threshold and species succumbed to mass extinction.
这是一个非常特殊的地方，有很多濒临灭绝的物种，而由于它位于海洋生物中心的偏远角落，所以经常被忽视。
This is very special and has a large number of endangered species, and as it's at the far corner of the Sea Life Centre, it often gets overlooked.
例如，一个移居的物种可能会因缺乏食物而灭绝。
A translocated species could die out from lack of food, for example.
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 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.
“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。
The fossil consists of a complete skull of an archaeocyte, an extinct group of ancestors of modern cetaceans.
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。
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.
在这一系列周期性物种灭绝事件里，白垩纪晚期恐龙和菊石的灭绝仅仅是其中一个比较严重的事件。
The late Cretaceous extinction of the dinosaurs and ammonoids was just one of the more drastic in a whole series of such recurrent extinction episodes.
或者通过世界野生动物基金领养一个濒临灭绝的物种，这样你能得到一个可爱的宠物和收养证书。
Or adopt an endangered species through the World Wildlife Fund, and you’ll get a lovable stuffed pet and adoption certificate.
市场中普遍见到的野猪是一个数量正在衰减的物种，绒毛猴也一样濒临灭绝。
The peccary that was most commonly traded is a species in decline and the woolly monkey is threatened with extinction.
或者通过世界野生动物基金领养一个濒临灭绝的物种，这样你能得到一个可爱的宠物和收养证书。
Or adopt an endangered species through the World Wildlife Fund, and you'll get a lovable stuffed pet and adoption certificate.
原始人类中任何一个灭绝的猿物种和我们的关系都比黑猩猩更密切。
A hominid is really any extinct ape more closely related to us than the chimpanzee.
目前，越来越多的物种濒临灭绝，这是一个重大的环境问题。
The rampant loss of species occurring today is a major environmental concern.
教一个珍稀物种不去捕食会使它们灭绝的食物？
Teach an endangered species not to eat the very thing that kills it and made it endangered?
世界上最后一只雄性的纯种哥伦比亚盆地侏儒兔最近不幸死亡。这致使美国在实施一个旨在试图拯救这种濒危物种免于灭绝的圈养繁殖计划的过程中，仅有两只纯种的雌性侏儒兔尚存。
The last male purebred Columbia Basin pygmy rabbit has died, leaving just two females in a captive breeding program created to try to save the endangered species from extinction.
“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。”
"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."
环保人士表示，动物园没有一头武广牛，也没有一个人知道如何将它们圈养。如果这一物种在野外消失，便意味着它们从此灭绝。
Conservationists said that with none in zoos and almost nothing known about how to keep them in captivity, if the species vanish in the wild they will be extinct.
礁石中断记录了每一个的过去五年内主要物种的灭绝。
Reef gaps have marked each of the past five major mass extinctions.
因为很多物种需要其它物种才能延续下去，所以一个物种的灭绝可能导致多米诺效应。
Because many species need others to survive, the worst possible case for an extinction is a domino-style co-extinction effect.
来之于小行星的撞击是物种灭绝的另一种可能的原因，尽管一个有报警作用的弹坑已经被找到了。
An asteroid impact is another possible cause of the extinction, though a telltale crater has yet to be found.
即使在“物种大灭绝事件不会在一个可预测的周期中发生”这一观点上达成科学共识，我们也没有理由去怀疑太阳有一颗黑暗的伴星。
Even if the scientific consensus is that extinction events don't occur in a predictable cycle, there are now other reasons to suspect a dark companion to the Sun.
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。
A mission aimed at rediscovering amphibian species thought to be extinct has yielded its first results.
小型虾类不仅能独一无二的从数次物种大灭绝中存活下来，还能依靠雌雄同体之一进行繁殖，正因为如此，只要存在一只便可产生一个新的种群。
Not only are the shrimp unique for having survived several major extinctions, they also can have both male and female reproductive parts so just one can generate a new colony.
目前，自然保护主义者面临着一个问题，到底有多少物种面临着灭绝的风险，对此他们知之甚少。
ONE of the problems facing nature conservationists is that they often have little idea what is being lost.
目前，自然保护主义者面临着一个问题，到底有多少物种面临着灭绝的风险，对此他们知之甚少。
ONE of the problems facing nature conservationists is that they often have little idea what is being lost.
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