250 million years ago is the Permian extinction.

二叠纪大灭发生在2.5亿年前。

The bear case rests on patience, a Persian restoration and a Permian boom.

看跌的理由在，波斯的恢复和二叠纪的繁荣。

The Permian event was particularly devastating to sea creatures.

二叠纪事件对海洋动物的破坏性尤其严重。

The synapsids divided into four streams, only one of which survived beyond the Permian.

下孔亚纲分成四支，只有一支闯过了二叠纪。

The idea that an impact caused the Permian extinction has been around for a while.

导致二叠纪大灭的原因长期以来都没有一个定论。

Presto! The Permian mass extinction is explained.

就这样！这就是二叠纪物种大灭的解释。

At the end of the Permian, the extinction figure was more than 80%.

在二叠纪末期，那场大灭带走了超过80%的物种。

The researchers said they see similarities between the Permian mass extinction and today's climate change problem.

研究人员说，他们看到了二叠纪集群灭和如今气候变化问题之间的相似之处。

Here in the Permian, we also start to see the first evidence of walking on two legs.

在二叠纪时期，我们也第一次发现了有些动物开始靠两条腿行走的证据。

The event took place at the end of what Earth scientists, or geologists, call the Permian Period.

这一事件发生在地球学家或地质学家所说的二叠纪末期。

And as it turned out, the Permian too was absolutely covered with previously inaccessible petroleum-rich shale rocks beneath the surface.

而事实证明，二叠纪盆地的地表下也对覆盖着以前无法触及的富含石油的页岩。

And then all eyes began once again turning back towards the gigantic Permian Basin over in west Texas.

然后，所有的目光又开始转向德克萨斯州西部巨大的二叠纪盆地。

The acquisition expands Chevron's shale-oil assets in America's Permian basin, where Anadarko is a leading independent operator.

此次收购扩大了雪佛龙在美国二叠纪盆地的页岩油资产，阿纳达是该地区领先的独立运营商。

It followed after Earth's worst mass extinction 252 million years ago at the end of the Permian Period.

在2.52亿年前地球上最严重的大灭之后，紧随着就是二叠纪末期。

Marathon owns assets in Eagle Ford in Texas, Bakken in North Dakota, Permian in New Mexico and Texas, and in Oklahoma.

马拉松石油公司在德克萨斯州的鹰滩、北达他州的巴肯、新墨西哥州和德克萨斯州的二叠纪盆地以及俄克拉荷马州拥有资产。

Now, dinosaurs did exist in this dry, post-Permian world.

现在，恐龙确实存在这个干燥的后二叠纪 世界。

But as the Permian went on, the climate got hotter and drier.

但随着二叠纪的进行，气候变得越来越 热和干燥。

We think something similar was the cause of the end-Permian extinction.

我们认为类似的事情是二叠纪末灭的原因。

The cause of the End-Triassic extinction is even murkier than the End-Permian extinction.

三叠纪末灭的原因甚至比二叠纪末灭的原因还要模糊。

In the Permian, at least 95 percent of animals known from the fossil record check out, never to return.

在二叠纪，至少95%从化石记录中得知的动物退了场，再也没有回来。