DNA证据显示现代人起源于两万年前的非洲。

DNA evidence indicates that modern humans originated in Africa about 200,000 years ago.

youdao

然后，非常突然地，不到两万年前，间冰段结束，很快，冰冻几乎就消失了。

Then, quite suddenly, less than 20,000 years ago, an interstadial began to run away with itself and, quite soon, the icy shroud was almost gone.

youdao

然后，非常突然地，不到两万年前，间冰段结束，很快，冰冻几乎就消失了。

Then, quite suddenly, less than 20, 000 years ago, an interstadial began to run away with itself and, quite soon, the icy shroud was almost gone.

youdao