Mars Global Surveyor has produced a nice 3d map of Mars that clearly shows these features.

火星环球探测者制作了一个不错的火星三维地图，这清楚地表明这些功能。

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NASA's Mars Global Surveyor, currently in orbit about the Red Planet, is finally providing some final answers.

最近环绕这颗红色行星轨道运行的nasa的全球监测机构最终提供了一些可靠的答案。

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The evidence is contained in pictures taken by the Mars Global Surveyor spacecraft, which is in orbit around the Red Planet.

正围绕着这颗红色的行星运转的火星球面勘测仪所拍摄的照片，包含有火星上有水的证据。

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Shortly afterwards, Mars Global Surveyor arrived, and the modern era of Martian exploration began.

ECONOMIST: Martian chronicles

Already in place is the Mars Global Surveyor, which has been circling the planet for several years.

BBC: New probe for Mars

Before Mars Global Surveyor, red planet researchers relied on Viking data from the 1970s, which yielded much lower resolution images.

CNN: Scientists debate implications of Mars pictures