The mountain gorilla is on the verge of extinction.
居住在山区的大猩猩已濒临灭绝。
Many of these species have vanished or are facing extinction.
这些物种中的许多已经消亡或是正濒临灭绝。
The loggers say their jobs are faced with extinction because of declining timber sales.
樵夫们说他们的工作因不断下降的木材销售而面临消亡。
This period of extinction wasn't comprehensive.
这一时期的灭绝并不彻底。
One consequence of global warming is extinction.
全球变暖的后果之一是物种灭绝。
One theory is that they were hunted to extinction by humans.
一种理论是，它们是由于人类的猎杀而灭绝的。
Why did the near extinction and migrations of wild animals occur?
为什么会发生野生动物濒临灭绝和迁徙的现象？
Hundreds of tree species face extinction because of deforestation.
由于森林砍伐，很多树种濒临灭绝。
The aye-aye's striking appearance may end up causing its extinction.
狐猴引人注目的外表可能最终导致了它的灭绝。
Once forest cover does start increasing, the rate of extinction should dwindle.
一旦森林覆盖开始增加，灭绝的速度应该变小。
This is most evident in cases where it results in the extinction of entire salmon populations.
这在导致整个鲑鱼种群灭绝的案例中最为明显。
The rates of extinction happening today are as great as the rates during these mass extinctions.
现今物种灭绝发生的速度和这些大规模灭绝的速度一样快。
Scientists have linked the mass extinction at the end of the Cretaceous with a meteorite impact on Earth.
科学家将白垩纪末期的大灭绝与地球上的陨石撞击联系起来。
The biggest was the Endangered Species Act of 1973, which protects imperiled animal species from extinction.
其中最著名的是1973年的《濒危物种法案》，该法案旨在保护濒临灭绝的动物物种。
Evidence points to hunting by humans and habitat destruction as the likely causes for the current mass extinction.
有证据表明，人类的捕猎和栖息地的破坏可能是导致当前物种大量灭绝的原因。
The Cambrian explosion involved rapid evolutionary diversification, followed by the extinction of many unique animals.
寒武纪大爆发涉及迅速的进化分化，随之而来的是许多独特动物的灭绝。
Many species of plants and animals are in danger of extinction, so it's high time that we take actions to protect them.
多种动植物濒临灭绝的危险，所以我们必须行动起来保护它们。
Some scientists hypothesize that the extinction of the dinosaurs resulted from the effects of an asteroid collision with Earth.
一些科学家假定，小行星撞击地球导致了恐龙的灭绝。
For instance, if it hadn't been for the extinction of the dinosaurs, we mammals would never have had an opportunity to flourish.
例如，如果没有恐龙的灭绝，我们这些哺乳动物就不会有机会繁荣昌盛。
Sea turtles, polar bears and giant pandas are just some of the thousands of animals in this world that are at risk of extinction.
海龟、北极熊和大熊猫只是世界上成千上万濒临灭绝的动物中的一部分。
Today we are witnessing a sixth mass extinction, but unlike the others, the current loss of bio-diversity can be traced to human activity.
今天，我们正在见证第六次物种大灭绝，但与其它几次不同的是，目前生物多样性的丧失可以追溯到人类活动。
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.
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。
From the standpoint of a traditional educator, this outcome indicated that schooling had failed to help students think about ecosystems and extinction, major scientific ideas.
从传统教育家的角度来看，这一结果表明，学校教育未能帮助学生思考生态系统和物种灭绝等主要科学思想。
Unless current greenhouse gas emissions drop, 70 percent of king penguins—1.1 million breeding pairs—will be forced to relocate their breeding grounds, or face extinction by 2100.
除非目前的温室气体排放量下降，否则70%的帝企鹅——即110万对繁殖伴侣——将被迫迁移它们的繁殖地，或者它们会在2100年前濒临灭绝。
The extinction of myriad biological species aroused deep concern which led people to an understanding of the special importance of protecting rare animals and plants on the brink of extinction.
无数生物物种的灭绝引起了人们的深切关注，使人们认识到保护濒临灭绝的珍稀动植物的特殊重要性。
The large, slow-growing animals were easy game, and were quickly hunted to extinction.
这种生长缓慢的大型动物很容易被猎杀，并很快被猎杀殆尽。
The large, slow-growing animals were easy game, and were quickly hunted to extinction.
这种生长缓慢的大型动物很容易被猎杀，并很快被猎杀殆尽。
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