Mars is the only other planet that once had water on its surface – which is why scientists are looking for signs of life there.

除地球以外，火星是唯一的另一个存在表层水的行星。 为此，科学家正在那里寻找生命的迹象。

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For example, scientists have found evidence that there could be liquid water-which is necessary for life on earth-at many places on the Mars.

他说，比如，科学家曾经在火星上的很多地方发现曾有液态水存在的证据，而这是生物生存的必要条件。

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There is water ice on Mars within reach of the Mars Phoenix Lander, NASA scientists announced Thursday.

NASA的科学家在周四宣布：在凤凰号火星车触手可及的地方发现了水冰。

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