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

VOA: special.2010.10.05

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

The huge animals died out about sixty-five million years ago.

VOA: special.2009.09.01

T.Rex lived between sixty-five and eighty-five million years ago.

VOA: special.2009.10.13