Photographic evidence suggests that liquid water once existed in great quantity on the surface of Mars.

照片证据表明，液态水曾大量存在于火星表面。

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During spring and summer, the surface of Mars is covered by strong storms.

在春季和夏季，火星表面被强风暴覆盖。

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The surface of Mars shows a wide range of geologic features, including huge volcanoes—the largest known in the solar system—and extensive impact cratering.

火星表面显示出广泛的地质特征，包括巨大的火山——太阳系中已知的最大的火山——和广阔的撞击坑。

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In it,he developed a theory that intelligent life had created waterways all over the surface of Mars.

VOA: special.2010.07.11

He said he could see changes in the seasons on the surface of Mars.

VOA: special.2010.07.11

She found out about the volcanic activity that has shaped the surface of Mars.

VOA: special.2010.07.28

We now have the ability to put remote control cameras on the surface of Mars.

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The room erupted and the world learned we'd just made it to the surface of Mars.

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The project at Oakfield Academy, Frome, was supposed to replicate conditions similar to the surface of Mars.

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