Whales originated in the freshwater lakes and rivers of ancient Asia about sixty million years ago.

鲸鱼起源于大约六千万年前亚洲的淡水湖泊和河流。

youdao

Dinosaurs existed on Earth more than sixty million years ago.

六千多万年以前，地球上就存在恐龙。

youdao

Suppose the planet were hit by a comet — this happened — something like this happened sixty-five million years ago, so it could happen again.

假设这个星球被一颗彗星击中-，这样的事，大约六千五百万年前，发生过，所以它还可能再发生。

youdao

It happened almost sixty million years ago and again thirteen million years ago.

VOA: special.2010.02.02

Suppose the planet were hit by a comet-- this happened--something like this happened sixty-five million years ago, so it could happen again.

假设这个星球被一颗彗星击中-,这样的事，大约六千五百万年前,发生过，所以它还可能再发生。

耶鲁公开课 - 金融市场课程节选

These creatures lived more than sixty-five million years ago, during Earth's late Cretaceous period.

VOA: special.2010.10.05

The fifth, the end-Cretaceous event, which occurred sixty-five million years ago, exterminated not just the dinosaurs but seventy-five per cent of all species on earth.

NEWYORKER: The Sixth Extinction?