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代的重大发现。

And so the fact we're finding these multituberculate mammals-a totally unrelated and ancient group of mammals-exhibiting social behavior means this was probably not uncommon among these early Mesozoic mammals.

因此，我们发现这些多瘤齿兽类物——一种完全无亲缘关系的古老的物群体——表现出社会行为的事实意味着，这这些早期代物可能并不罕见。

This would have been especially important in the extreme climate of the early part of the Mesozoic Era. The days were hot, the nights, cold.

这一点代早期的极端气候尤为重要。那时候白天很热，晚上却很冷。

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

这些外部量始于代末期，当时板块构造造成了北美洲和亚洲的山脉抬升。

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

有一种假说古物学家越来越受欢迎，那就是外星撞击塑造代地区所起的作用。

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

这代早期的极端气候条件下尤其重要。

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

第一次发大约1.5亿至1.4亿年前的代。

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

我想对于这个活，我要删除“代”，因为我觉得它没用。

The Mesozoic Era, spanning over 180 million years.

代，跨度超过 1.8 亿年。

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

比如，“代”是非常专业的词，你可能不会考试遇到，所以我把它删掉了。

That period is called the Mesozoic Era.

那个时期被称为代。

This last item brought him obvious satisfaction. His day, usually a jelly-like creature, a shapeless, spineless thing, had attained Mesozoic structure. It was marching along surely, even jauntily, toward a climax, as a play should, as a day should.

这最后一项显然让他很满意。他的时代，通常是一种果冻状的物，一种没有形状、没有脊椎的东西，已经达到了代的结构。它稳步地，甚至是欢快地，朝着高潮前进，就像一出戏，就像一天应该的那样。

Well, it shows that different branches of Mesozoic " mammals, " including ours, were converging on some similar traits, even if they weren't closely related.

好吧，这表明代“物” 的不同分支，包括我们人类， 都一些相似的特征上趋同，即使它们不是密切相关的。

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

他们找到代齿象化石。

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

舞台是为 代的第一幕，三叠纪。

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

随着更多代鸟类化石的发现， 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.

这些大多来自代，该时期被划分为三个阶段：三叠纪、侏罗纪和白垩纪。

They lived during a period of time called the Mesozoic Era which started about 250 million years ago and ended about 65 million years ago.

他们活一段叫做代的时期，这段时期始于大约 2.5 亿年前，结束于大约 6500 万年前。

And, just within my own lifetime, a wealth of bird fossils has been discovered that are only beginning to reveal the wonderfully weird and diverse world of the Mesozoic, when birds had teeth.

而且，我自己的 lifetime 里， 已经发现了大量鸟类化石， 这些化石才刚刚开始揭示代那个奇妙而多样的世界，那时鸟类还长着牙齿。

Tyrannosaurus, Triceratops, and Pachycephalosaurus, however were all alive at the end of the Mesozoic Era, so answers B, C, and, D are correct.

然而，霸王龙、三角龙和厚头龙都代末期还活着，所以答案 B、C 和 D 是正确的。