For years scientists blamed the extinctions on climate change.
多年来，科学家们将物种灭绝归咎于气候变化。
Most invertebrate species disappeared during a wave of extinctions.
大多数无脊椎动物在一次（物种）灭绝浪潮中消失了。
Why did scientists want more information about the dinosaur extinctions?
为什么科学家们想要了解更多关于恐龙灭绝的信息？
Some hypotheses fail to account for simultaneous extinctions on land and in the seas.
有些假说不能解释同时发生在陆地和海洋的灭绝。
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。
According to some estimates, the majority of all extinctions of species may be due to such impacts.
据估计，大多数物种的灭绝可能是由于这些影响造成的。
Surprisingly few extinctions of indigenous species can be attributed to competition from introduced species.
令人惊讶的是，本土物种的灭绝很少归因于外来物种的竞争。
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。
There's compelling evidence that global warming will be a significant driver of many plant and animal extinctions in this century.
有令人信服的证据表明，全球变暖将是本世纪许多动植物灭绝的一个重要原因。
The Permian event has attracted much less attention than other mass extinctions because mostly unfamiliar species perished at that time.
二叠纪大灭绝事件比其他大灭绝事件受到的关注要少得多，因为那时灭绝的大多是我们不熟悉的物种。
There have been numerous well-documented extinctions of indigenous species caused by the introduction of non-indigenous predators and pathogens.
由于引入了非本地的捕食者和病原体，已经有许多本土物种灭绝的记录，证据确凿。
Dissatisfaction with conventional explanations for dinosaur extinctions led to a surprising observation that, in turn, has suggested a new hypothesis.
人们对恐龙灭绝的传统解释感到不满，导致了一个令人惊讶的发现，转而引发了新的假设。
A few astronomers thought they could see even more of a dinosaur-cosmos link, a pattern of mass extinctions occurring like clockwork in the geologic record.
一些天文学家认为他们可以看到更多的恐龙与宇宙之间的联系，这种大规模灭绝的模式就像地质记录上的时钟一样。
The paucity of known extinctions or disruptions resulting from indirect interactions may reflect not the infrequency of such mishaps but rather the failure to look for or to detect them.
间接相互作用导致的已知物种灭绝或破坏的情况的稀少，反映的或许不是这种灾难的罕见，而是没有去寻找或检测它们。
Worse, the law may actually speed up extinctions.
有时依法反而更糟，可能变相加速动物的灭绝。
If there were no asteroids would there be no extinctions?
如果没有小行星，就不会有灭绝了吗？
Compared with nearly all the previous extinctions this would be fast-track.
与之前的五次相比，这次物种灭绝可谓神速。
She said a major cause of the extinctions are plants and animals not native to Hawaii.
她说非夏威夷本土的动植物引入是促使物种灭绝的主要原因。
Some experts believe that Marine dysoxia may be responsible for major oceanic extinctions.
一些专家认为，海洋缺氧可能是主要海洋物种灭绝的元凶。
The theory of periodic extinctions itself is still debated, with many insisting that more proof is needed.
物种周期性大灭绝的理论本身依然是备受争议的，需要更多的证据以便进一步地论证。
These occasional comet showers could be why the mass extinctions on Earth are so regular, some scientists believe.
一些科学家认为，这些偶然的彗星雨可能就是为什么地球上的大规模物种灭绝如此规律地发生的原因。
Melott's hypothesis about mass extinctions shows how habitable zones may be measured not just in space but also in time.
Melott有关大灭绝的假想表明“宜居地带”不能只在空间上衡量，还得包括时间。
Evidence from fossils suggests that in the "Big Five" extinctions, at least 75 percent of all animal species were destroyed.
从化石可以证明，在过去的五次大灭绝中，75%动物物种消失。
We are experiencing the greatest wave of extinctions since the disappearance of the dinosaurs: Every hour, three species disappear.11
我们正面临着自恐龙灭绝以来最大的物种消亡：每1个小时，有3个物种从地球上消失。
In the 1980s scientists believed that Earth's regular extinctions could be the result of a distant dark twin of the Sun, called Nemesis.
20世纪80年代时科学家们认为地球周期性的生物灭绝可能是由遥远太空的涅墨西斯星球造成的，该星球和太阳很相似。
In the 1980s scientists believed that Earth's regular extinctions could be the result of a distant dark twin of the Sun, called Nemesis.
20世纪80年代时科学家们认为地球周期性的生物灭绝可能是由遥远太空的涅墨西斯星球造成的，该星球和太阳很相似。
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