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。

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They continue to exist under the surface and may come out in other forms.

它们会继续存在于表面之下并以别的形式表现出来。

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They continue to exist under the surface and may come out in other forms.

它们会继续存在于表面之下并以别的形式表现出来。

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