二叠纪大灭绝

near extinction───濒临灭绝

pefrom an examination───从考试中

threat of extinction───灭绝的威胁

crucial distinction───关键区别

important distinction───重要区别

perform an evaluation───进行评估

extinction───n.灭绝；消失；消灭；废止

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。

Scientists are still debating the cause of the end-Permian extinction, the biggest the Earth has ever known.───科学家们对地球上有史以来最大的二迭纪末大灭绝的原因依然有争议。

The die-off was surpassed only by the gargantuan Permian extinction 250 million years ago.───只有2亿5000万年前史上空前的二叠纪大灭绝盖过这次灭绝。

And I worked on this Permian extinction, camping by this Boer graveyard for months at a time.───当时我在研究二叠纪生物灭绝事件，每次都在波尔的墓地露营好几个月。

This animal spread across the massive, ancient continent of Pangea after the end of the Permian Extinction.───这在大规模，古老的盘古大陆动物传播后二叠纪灭绝结束。

A Bivalve Radiation after the End-Permian Extinction───二叠纪末大灭绝后双壳类新的辐射

This animal spread across the massive, ancient continent of Pangea after the end of the Permian Extinction.