The Mesozoic Era, spanning over 180 million years.

代，跨度超过 1.8 亿年。

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代地区所起作用。

Yes, but tell me a dinosaur chicken salad sandwich wouldn't hit the Mesozoic spot.

对啊，但别告诉我一个恐龙鸡沙拉三明治没有代感觉。

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1.4亿年前代。

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

这在代早期极端气候条件重要。

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，我要删除“代”，因为我觉得它没用。

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

他们找到代乳齿象化石。

That period is called the Mesozoic Era.

那个时期被称为代。

By studying these ancient clues, paleontologists piece together the puzzle of the Mesozoic era.

通过研究这些古老线索，古物学家拼凑出了代谜团。

Most of its fossils date to the Mesozoic, between 252 and 66 million years ago.

它大部分化石可以追溯到 252 到 6600 万年前代。

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

它活在代之前时代， 在古代。

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

侏罗纪之后是代最后一个时期。

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

随着更多代鸟类化石发现， 更多线索开始出现。

The climate during the Mesozoic was much different than what we see today.

代气候与我们今天看到有很大不同。

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

但对于代巨型爬行动物来说， 它们统治地位原来是它们垮台。

Over the vast epochs of the Mesozoic era--the Triassic, Jurassic, and Cretaceous periods--dinosaurs evolved into myriad forms.

在代漫长时期——三叠纪、侏罗纪和白垩纪——恐龙进化成了无数形态。

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

舞台是为 代第一幕，三叠纪。

The Mesozoic is sometimes called the Age of Dinosaurs, but plenty of other animals lived at that time, too.

代有时被称为恐龙时代，但当时也活着许多他动物。

During much of the Mesozoic era, the world was warmer than today, with no polar ice caps.

在代大部分时间里，世界比今天温暖，没有极地冰盖。

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

比如，“代”是非常专业词，你可能不会在考试遇到，所以我把它删掉了。