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。
Corals have survived 5 mass extinctions.
珊瑚生存的5大灭绝。
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。
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。
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。
Emissions continue to climb, so unless there's a drastic turnaround, expect the sea level rises, extreme weather events and mass extinctions associated with a rapidly warming globe.
目前其排放量还在上升，因此，除非有急剧转变，否则迅速变暖的地球将遭遇海平面上升，极端气候增加和大规模物种灭绝等一系列难题。
But now scientists claim that the regularity of the mass extinctions actually disproves the Nemesis theory because its orbit would have changed over time as it interacted with other stars.
然而现在科学家称大灭绝的周期性实际上证明涅墨西斯星球理论是错误的，因为随着时间的推移，在和其他星球的相互作用下，星球的运行轨迹会发生改变。
Kikai weighed in at 7 on the standard volcanic explosivity index (VEI), which runs from 1 to 8, VEI 8 being reserved for the sort of mega-eruptions that cause ice ages and mass extinctions.
Kikai火山的标准火山爆炸性指数(VEI)为7。ve I分为1到8八个等级，而VEI 8则用来描述那种造成冰期和大规模灭绝的火山爆发。
The previous five mass extinctions happened well before mankind existed and are believed to have been mainly caused by natural disasters, such as asteroid impacts and volcanic eruptions.
之前的五次大规模物种灭绝发生在人类出现之前，而且这些灭绝被认为主要是由自然灾害引起的，如小行星撞击和火山喷发。
The previous five mass extinctions happened well before mankind existed and are believed to have been mainly caused by natural disasters, such as asteroid impacts and volcanic eruptions.
之前的五次大规模物种灭绝发生在人类出现之前，而且这些灭绝被认为主要是由自然灾害引起的，如小行星撞击和火山喷发。
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