It's all very mysterious and we send off a spaceship to investigate the markings, the radio signals from the other place.

一切都很神秘,所以我们,派遣一艘飞船去调查星球上的印记,以及那些从其他星球传来的无线电信号

耶鲁公开课 - 死亡课程节选

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