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。
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。
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。
Several other mass extinctions in the geological record have been tentatively identified with large impacts, but none is so dramatic as the Cretaceous event.
地质记录中的其他几次大规模物种灭绝也被认为影响重大，但没有哪一次像白垩纪大灭绝那样夸张。
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 fossil record indicates that in all the time that animals have inhabited Earth, there have been five great mass extinctions, dinosaurs being the most recent.
化石记录表明，在地球有动物居住的所有时期，已经有五次大灭绝发生，恐龙是最近的一次。
Corals have survived 5 mass extinctions.
珊瑚生存的5大灭绝。
They have survived at least four planetary mass extinctions.
它们至少经历了四次地球物种灭绝，一直活到了今天。
Reef gaps have marked each of the past five major mass extinctions.
礁石中断记录了每一个的过去五年内主要物种的灭绝。
Scientists then began searching the layers of rocks delineate mass extinctions.
科学家们开始研究详细记录了大规模灭绝事件的岩石层。
Ifnot for the mass extinctions of the past, we would likely not be hereto talk about it.
如果不是因为过去的大灭绝，我们可能不会坐在这里来讨论这件事。
Though these mass extinctions are deadly events, they open up the planet for new life-forms to emerge.
尽管这些大规模物种灭绝是致命的事件，可是这些事件也打开了地球上新生活方式的出现。
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。
Although not one of the "big five" mass extinctions, the mid-Permian extinction has long been considered an important, if puzzling, event.
尽管不是五次物种大灭绝之一，二叠纪中期的物种灭绝依然被长期作为谜一般的事件受到重点关注。
A few astronomers thought they could see even more of a dino-cosmos link - a pattern of mass extinctions occurring like clockwork in the geologic record.
一些天文学家认为，恐龙-宇宙之间的联系远不止表面那么简单，这种大规模生物灭绝现象产生模式简直就像地质记录中的发条装置，到了某个特定时刻，就会发生。
Many of the sequences have never been filmed before. Some may never be filmed again. Corals have survived 5 mass extinctions. But can they survive us?
许多序列前从未拍过。有些人可能永远不会被再次拍摄。珊瑚生存的5大灭绝。但他们能否生存呢？
Human population is drastically reduced. Perhaps 90% of species become extinct, rivalling the worst mass extinctions in the Earth's 4.5 billion-year history.
人口数量大幅减少，也许90%的物种会灭绝，情况堪与地球45亿年历史中最严重的大规模灭绝匹敌。
While there’s little doubt about the destructive power of cosmic impacts, there is no evidence that comets have periodically caused mass extinctions on our planet.
虽然天体撞击的毁灭性不容置疑，但是没有证据表明彗星导致了地球物种周期性的大灭绝。
The big concern for me is that unless we curb carbon emissions we risk mass extinctions, degrading coastal waters and encouraging outbreaks of toxic jellyfish and algae.
我最大的担忧是，除非我们限制二氧化碳排放，我们就有可能面临大规模灭绝，沿岸水域退化和有毒水母及海藻大规模暴发的风险。
The best-known such event was the one that wiped out the dinosaurs 65m years ago, but that was not the worst; the planet has suffered several such large mass extinctions
这类事件中最著名的一个就是6500万年前恐龙的灭绝，但这还不是最坏的；这个星球已经经历了几次如此大规模的灭绝。
Some scientists theorize that some, if not all of the mass extinctions that have wiped out thousands of species of life on Earth might be correlated with magnetic reversals.
一些科学家的理论认为，即使不是所有的毁灭地球上数以千计生物物种的大规模的灭绝与地磁倒转有关，也会有一些事件可能与地磁倒转有关。
Some scientists theorize that some, if not all of the mass extinctions that have wiped out thousands of species of life on Earth might be correlated with magnetic reversals.
一些科学家的理论认为，即使不是所有的毁灭地球上数以千计生物物种的大规模的灭绝与地磁倒转有关，也会有一些事件可能与地磁倒转有关。
应用推荐