The presence of water on Mars is a hot topic for scientists.
有水存在的火星对于科学家来说是一个热门的话题。
NASA has found evidence of water on Mars in the past.
美国航空航天局以前也找到过火星上有水的证据。
The polar deposits contain most of the known water on Mars.
极地的冰层储存着火星上绝大部分已知水源。
Recent orbital images show that water might still occasionally flow on the surface of Mars.
最近的轨道照片显示水仍然偶尔流过火星表面。
One known fact is that there are forms of water under the surface of Mars.
已知火星表面下面有水的形式物质存在。
For example, evidence is mounting that liquid water may flow underneath the surface of Mars.
比如，越来越多的证据表明火星地表下可能有水流。
For example, evidence is mounting that liquid water may flow underneath the surface of Mars.
比如，越来越多的证据表明火星地表下可能有水流。
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