But what does all of this mean for our lineage of mammaliaforms, the crown mammals?

但是，所有这一切对我们的哺乳动物谱系（皇冠哺乳动物）意味着什么呢？

And those early mammaliaforms were like us in some ways... but weren't quite there yet in others.

那些早期的哺乳动物在某些方面与我们相似… … 但在其他方面还不完全一样。

Did it actually evolve in mammaliaforms first, too?

它实际上也是首先以哺乳动物形式进化的吗？

So, a lot of traits that we think of as being unique to crown mammals actually evolved earlier, in various different mammaliaforms.

因此，许多我们认为是皇冠哺乳动物独有的特征实际上更早以各种不同的哺乳动物形式进化。

The earliest ancestors of mammaliaforms had four bones in their jaws, and the jaw joint was formed by two bones called the articular and the quadrate.

哺乳类动物最早的祖先在颌骨中有四块骨头，颌关节由称为关节和方骨的两块骨头组成。

If we trace these guys back to their most recent common ancestor with crown mammals, we end up with a group known as the mammaliaforms.

如果我们将这些家伙追溯到它们最近与皇冠哺乳动物的共同祖先，我们最终会得到一个被称为哺乳动物的类群。

This is a trait that's shared among other mammaliaforms, and it's this feature that typically separates Morganucodon and mammaliaforms like it from the crown mammals.

这是其他哺乳动物共有的特征，正是这个特征通常将 Morganucodon 和类似的哺乳动物与皇冠哺乳动物区分开来。

After the evolution of fur, the first mammaliaforms appeared sometime between 215 and 205 million years ago - and their fossils show us that mammal-like jaws were the next features to arise.

在毛皮进化之后，第一批哺乳动物出现在 215 到 2.05 亿年前的某个时间——它们的化石向我们表明，类似哺乳动物的下颚是下一个出现的特征。

And one reason this trait might've been important for early mammaliaforms and then for the first crown mammals is that many of them were small insectivores who probably hunted at night.

这种特性可能对早期哺乳动物很重要，然后对第一个皇冠哺乳动物很重要的一个原因是，它们中的许多都是小型食虫动物，可能在夜间捕食。

They think that these were made by animals called therapsids, the group that would later go on to include mammals -- but that poop came from members of this group that were around before any mammaliaforms existed.

他们认为这些是由称为兽孔目动物的动物制造的，该类动物后来包括哺乳动物——但粪便来自该类动物的成员， 这些动物在任何哺乳动物形式存在之前就已存在。

And the ancestors of the crown group would diversify into all the different mammals we know today, united by those four classic mammalian traits, while the last of the ancient mammaliaforms would die out.

冠群的祖先会分化成我们今天所知道的所有不同的哺乳动物，由这四种经典哺乳动物特征结合在一起，而最后一种古代哺乳动物将会灭绝。