二叠纪大灭绝也成就了爬行类生物的崛起,
one branch of which turned into Tyrannosaurus, Diplodocus and all the other names familiarfrom childhood.
它们的一支最后演化成了如今小学生们口中的暴龙、梁龙以及其它各种叫龙的动物。
The idea that an impact caused the Permian extinction has been around for a while.
导致二叠纪大灭绝的原因长期以来都没有一个定论。
As at the end of the Permian, as at the end of the Cretaceous, huge volcanic eruptions hadbeen going on for hundreds of thousands of years.
在二叠纪和白垩纪末期,大量火山持续爆发了数百到数千年。
These may have weakened the world s ecosystems, making them vulnerable to anexternal shock.
这可能破坏了地球的生态系统,使其难以抵御外来的破坏。
But the abruptness of both extinctions indicates that the coup de grace was administered bysomething else,
但是两次大灭绝来得如此突然,这说明了实施致命一击的另有其人,
and in the case of the Permian some fragments of meteorite of the correct age, found in rockin Antarctica, suggest that, as with the Cretaceous, that something was an asteroid or acomet.
而且在南极洲的岩石里发现的一些陨星碎片与二叠纪的年代相吻合,这说明了地球在二叠纪与在白垩纪一样,遭受了小行星或是彗星的袭击。
【2015考研英语阅读大灭绝】相关文章:
最新
2016-10-18
2016-10-11
2016-10-11
2016-10-08
2016-09-30
2016-09-30