First, life in college is not easy.

首先，大学生活不容易。

The first life appeared about a billion years later.

第一个生命出现在大约十亿年后。

You don't create your life first, and then live it.

你不是先创造生活，然后活下去。

Four and a half billion years ago. The first life forms appeared.

四十五亿年前。最早的生命形式出现了。

This led to the debut of the first life forms here on Earth.

于是地球上慢慢开始出现了生命。

And it would be tragic if we killed the first extraterrestrial life we found.

如果我们杀死了我们发现的首个外星生命，那可就悲剧了。

Still, many scientists agree the first life forms were single-cell organisms that lived in the oceans.

目前多数科学家一致认为生命的最初形式单细胞生命体都诞生于早期海洋中。

LUCA wasn't the first life form, but it's as far back as we can trace.

LUCA不是最初的生命形式，但它是我们所能追踪到的最早生命形式。

We're not the first life form to change the climate on the Earth.

我们不是第一个改变地球气候的生命形式。

At 6: 30pm, these cells begin to form colonies, and thus, the first multi-cellular life develops.

下午 6 点 30 分，这些细胞开始形成菌落，第一个多细胞生命由此诞生。

And this would be the first life on Mars and the furthest life had ever traveled as far as we know.

这将是火星上的第一个生命，也是我们所知道的最远的生命。

They were the very first life on Earth, and they gave rise to every one of the billions of species that have inhabited our planet since.

它们是地球上最初的生命，催生了我们星球上栖息的数十亿个物种。

Actually, this is not my real name. It stuck to me when my second life began, what I'm going to tell you about my first life.

其实 这不是我的真名 当我的第二次生命开始的时候 我一直在想 我要告诉你们的关于我第一次生命的事情。

The first life form wouldn't have had other organisms to consume, of course, so it must have been an autotroph, generating energy either from the sun or from chemical gradients.

当然，最初的生命本来就不会有其他生物来消耗其能量，所以它一定是从太阳或化学梯度产生能量的自养体。