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

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