Researchers say they have made a major discovery straight out of the Mesozoic era.

研究人员说，他们有了一个直接来自的重大发现。

The Mesozoic Era, spanning over 180 million years.

，跨度超过 1.8 亿年。

The first one occurred around 150 million to 140 million years ago during the Mesozoic era.

第一次发在大约1.5亿至1.4亿年前的。

And I think for this activity, I'm going to delete " mesozoic" because I don't care.

我想对于这个活动，我删除“”，因为我觉得它没用。

This would have been especially important in the extreme climate of the early part of the Mesozoic Era.

这在早期的极端气候条件下尤其重。

One hypothesis that has gained popularity among paleontologists is the role of extraterrestrial impacts in shaping the Mesozoic area.

有一种假说在古物学家越来越受欢迎，那就是外星撞击在塑造地区所起的作用。

Like, " mesozoic" is really technical, you're probably not going to get that on the test, so I will delete that.

比如，“”是非常专业的词，你可能不会在考试遇到，所以我把它删掉了。

That period is called the Mesozoic Era.

那个时期被称为。

… now when they found the remains of the Mesozoic mastodon...

他们找到乳齿象化石。

The stage was set for the first act of the Mesozoic, the Triassic Period.

舞台是为 的第一幕，三叠纪。

As more fossils of Mesozoic birds were found, more clues started to present themselves.

随着更多鸟类化石的发现， 更多线索开始出现。

Most of these are from the Mesozoic era, which is divided into three periods, Triassic, Jurassic, and Cretaceous.

这些大多来自，该时期被划分为三个阶段：三叠纪、侏罗纪和白垩纪。

Meanwhile, the descendants of those little cynodonts persisted through the entire Mesozoic Era, hiding in the dinosaur's shadows.

与此同时， 那些小型犬齿兽的后在整个时期都存活了下来，在恐龙的阴影下隐藏着。

But for the giant reptiles of the Mesozoic, their dominance turned out to be their downfall.

但对于的巨型爬行动物来说， 它们的统治地位原来是它们的垮台。

It lived in the era before the Mesozoic, in the Paleozoic.

它活在之前的时， 在古。

Alright... so now we know about our mammal relatives from the Mesozoic, but what happened after during the Cenozoic?

好吧… … 现在我们知道了一些的哺乳动物亲戚，那么在新发了什么呢？

These events ushered in the third act of the Mesozoic: The Cretaceous Period.

这些事件迎来了 的第三幕：白垩纪。

After the Jurassic period came the last period of the Mesozoic Era.

侏罗纪之后是的最后一个时期。

These external forces began at the end of the Mesozoic, when plate tectonics caused the uplift of mountains in North America and Asia.

这些外部力量始于末期，当时板块构造造成了北美洲和亚洲的山脉抬升。

It was during the Cretaceous period that a third major reptilian group began patrolling Mesozoic waters joining the Ichthyosaurs and Plesiosaurs.

正是在白垩纪时期，第三个主的爬行动物群开始与鱼龙和蛇颈龙一起在水域巡逻。