Water is a key to the question of whether life, even in the form of microbes, ever existed on Mars. On Earth, all known forms of life require water.

水是一个是否有生命存在的关键问题，即使是以微生物的形式，火星上和地球上都曾经存在，所有已知的生命都需要水。

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They are eager to learn about the history of water on Mars because water is fundamental to the question of whether the planet has ever harboured microbial or some other life.

科学家们渴望了解火星水的历史，因为水是最根本的，决定了该行星上是否曾经生活着微生物或其他形态的生命。

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