And so begins the Age of Mammals.

哺乳动物时代就这样开始了。

At twenty-one minutes to midnight they vanish and the age of mammals begins.

午夜前20分钟，它们消失了，哺乳动物的时代开始了。

The meteorite killed off the dinosaurs and started the Cenozoic Era, or what is known as the age of mammals.

那颗陨石杀死了恐龙，开启了新生代，也就是众所周知的哺乳动物时代。

So, while the Age of Mammals only really got going when the Mesozoic ended, it's worth remembering that our success as crown mammals started much, much earlier.

因此， 虽然哺乳动物时代在中生代结束时才真正开始，但值得记住的是， 我们作为皇冠哺乳动物的成功开始得非常非常早。

This is one of our earliest origin stories - one that starts in the Mesozoic or even before - and continues with us, now, in what's sometimes called the " age of mammals." So what even is a mammal?

这是我们最早的起源故事之一——一个始于中生代甚至更早的故事——一直延续到现在，有时被称为“哺乳动物时代” 。 那么什么是哺乳动物呢？