One particular transposon first appeared about a million years ago.

一种特别的转位子最早出现在一百万年前。

Maybe not a million years ago. But 400 million years ago days were 21 and a half hours long, which you would have noticed.

可能不是一百万年前，而是4亿年前的某一天，当时一天长21.5小时，这样你可能就能注意到。

So a million years ago, we were essentially an endangered species.

所以一百万年前，我们实际上是一个濒危的物种。

Each species lasted a million years ago or so and then another species, another species.

每个物种存活100万年左右，之后是另一种物种，接着另一种。

In the article on Wiki, I read something ordinary and usual, others I already know a million years ago.

对我来说， 维基全书上的文章提到的资料一点也不陌生。

Crude tools, such as sharp stones for cutting or scraping , may have existed as long as a million years ago.

像可切割或刮刨的锋利石片这些原始工具，可能在早在一百万年前就已存在。

Created by comic legend Jack Kirby in 1976, the Eternals are a race of ancient human beings created a million years ago by the cosmic entities known as the Celestials.

漫画传奇人物杰克·科比在1976年创作了《永恒族》。永恒族是古人类中的一支种族，宇宙天神组在一百万年前创造了他们。