Geologists measure time in eons, eras, periods, epochs and ages, with eons being the longest.

地质学家用宙、代、纪、世和期来衡量时间，宙是最长的。

Apparently, star formation in ellipticals came and went eons ago.

显然，椭圆星系中恒星的形成活动在很久以前就开始了。

Over the eons of our evolutionary changes, our diet became very varied.

经过亿万年的进化变化，我们的饮食变得非常多样化。

Over the eons, nature has stumbled on many different ways of desquishifying organisms.

亿万年来，大自然偶然发现了许多不同的生物脱水方法。

By the time dinosaurs jumped on the feather bandwagon, they were so last eon!

等到恐龙进化出羽毛的时候，它们其实已经很落后了！

For millions of years, the Gunnison River has been carving this canyon at work across eons of isolation.

几百万年来，甘尼森河静静地流过孤独的黑峡谷。

Apparently, Mars suffered a tremendous impact from an object hundreds of kilometers across eons ago.

显然，火星在亿万年以前曾被一个宽达上百公里的物体撞击。

Over the eons, this has cleaned out a lot of otherwise dangerous objects that could have eventually hit Earth.

长久以来，这清理了许多原本可能会撞击地球的危险物体。

But in those deep craters it can persist, accumulating over the eons.

但在那些陨石坑深处水就得以被保存，并在亿万年中不断积累。

The craters in the highlands are from countless impacts over the eons from asteroids and comets.

月陆上的陨石坑是由无数的小行星和彗星撞击而形成的。