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。
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。
"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。”
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。
But sadly, we are now on the verge of becoming an extinct - or at least threatened - species.
但是令人伤心的是，现在我们却站在了绝种，或者是濒临绝种，的边缘。
An animal species becomes extinct when it fails to produce enough young in each generation to keep pace with the death-rate.
当一种动物不能在每一代都繁殖出足够的后代而与其死亡率保持一致时，它就会逐渐灭绝了。
Is the 'hobbit' -- the nickname given to diminutive skeletons found on the Indonesian isle of Flores in 2003 -- in fact an extinct human species, enough to be called Homo floresiensis?
2003年，在印度尼西亚的弗罗里斯岛上发现了一些小得出奇的骨骼化石，他们被亲切地称作“霍比特人”，这些霍比特是不是一个灭绝的人种？ 他们可以被正式地称作弗罗里斯“人”吗？
Cryptozoologists are especially proud of the catch in1938of a coelacanth an archaic -looking species of fish that had been thought to have gone extinct in the cretaceous.
令未知生物学家尤其骄傲的是1938年捕捉到的腔棘鱼，牠是一种样貌古老的鱼类，原先认为在白垩纪便已灭绝。
An animal species becomes extinct when it fails to produce enough young in each generation to keep pace with the death rate.
一种动物如果不能在每一代都生下足够的后代来与死亡率抗衡的话，它们将走向灭绝。
In at least one case, a species that was long extinct in its native range was treated as an interloper when it finally returned home.
有时一个物种在原生地域灭绝多年后再度回归，结果被当做闯入者对待。这种情况至少出现了一例。
Cryptozoologists are especially proud of the catch in 1938 of a coelacanth, an archaic-looking species of fish that had been thought to have gone extinct in the Cretaceous.
令未知生物学家尤其骄傲的是1938年捕捉到的腔棘鱼，牠是一种样貌古老的鱼类，原先认为在白垩纪便已灭绝。
An example is the KT Mass Extinction when the last dinosaur and ammonite species, among others, became extinct, perhaps as a result of an asteroid striking the Earth.
比如，白垩纪至第三纪所发生的大灭绝。当时，可能由于一颗小行星撞击地球，恐龙和众多同时代的物种都灭绝了。
If we dont put an end to the trend, then the fish in the ocean could become extinct species in the foreseeable future.
如果我们不结束这已趋势，鱼类可能在不远的将来变成灭绝品种。
If we dont put an end to the trend, then the fish in the ocean could become extinct species in the foreseeable future.
如果我们不结束这已趋势，鱼类可能在不远的将来变成灭绝品种。
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