extinctions

"In the case of birds, " he said, "lots of extinctions, no change in total biodiversity. "

他说：“就鸟类来说，一部分的灭绝并没有改变总体上的生物多样性。”

Because there was no evidence linking space objects to the remaining mass extinctions scientists began looking back to earth.

由于没有证据显示太空天体跟其余的灭绝事件有关，科学家们又开始返回来关注地球。

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。

That increase was associated with mass extinctions, which, to put it mildly, probably would not be good for living standards.

这种上升导致了大量物种灭绝，客气点说，就是不利于我们生活。

An expert said the dating is significant because some researchers have blamed the extinctions on extended droughts that occurred later.

一位专家说，这次年代测定具有重要意义，因为有些研究者把动物绝种归咎于发生较晚的长期干旱。

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。

The new view of mass extinctions is, yes, we were hit, and, yes, we have to think about the long term, because we will get hit again.

对物种大灭绝，从一个新的角度看，是的，我们被撞击了，而且，是的，我们不得不从长远考虑，因为我们会再次被撞击。

Therefore, some climate change or other environmental factor must have caused the species' extinctions .

因此，一定是一些气候上的变化或其他环境因素导致了这些物种的灭绝。

The biodiversity of New York today is the result of extinctions, invasions and adaptations.

纽约今天的生物多样性就是灭绝、入侵和适应的产物。

Debate over the cause of these extinctions has focused on the primacy of humans and climate in driving this dramatic loss of large mammals.

关于造成这些大型哺乳动物灭绝的原因的争论主要放在了人类及气候上。

That date marks one of five recognised mass extinctions in history (the end of the Cretaceous was another).

第一个时间点也是史上5次著名的大规模物种灭绝事件之一（另一次发生在白垩纪末期）。

(See " Apocalypse Meow, " below. ) They're also responsible for at least 33 avian extinctions worldwide.

（参考下面”猫的启示“）对全球至少33种鸟类的灭绝，它们也逃脱不了干系。

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。

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。

We're living in a time of mass extinctions that exceeds the fossil record by a factor of 10, 000.

我们现在正处于物种大量灭绝的时代，数据是恐龙灭绝数据的1万倍。

Yale: I know there've been a few extinctions, Don, but not that many.

唐，我知道地球确实经历了几次物种灭绝，但没你说的那么多。

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。

As they reported last month in the journal Nature, the current rate of extinctions is far above normal.

上个月发表于《自然》杂志的这份研究报告显示，目前物种灭绝的速度远远高于正常水平。

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。

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。