The hills are remnants of an earlier geological era, scraped bare of most soil and exposed to the elements.

这些山丘是早期地质时代的遗迹，大部分土壤都被刮掉， 暴露在自然环境中。

These different layers likely represented different  geological eras, which would give scientists the clearest picture of the history of Jezero, as well  as giving them an opportunity to find life itself.

这些不同的地层可能代表不同的地质时代，这将使科学家能够最清晰地了解杰泽罗的历史，并给他们一个发现生命本身的机会。