Visible also in the above images are the north polar cap of Mars, dark and light soil, clouds, and, in the early images, a global dust storm.

上面的影像中也可以看到火星的北极冰帽，亮暗不同的土壤，云层，以及早期影像中的沙暴。

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The northern ice cap sits nestled within a deep depression that covers essentially the entire northern hemisphere of Mars and drops in elevation as it nears the pole.

北部 冰冠位于基本覆盖了整个火星北半球的一个深奥的凹陷处的内部，在接近极地处，海拔下降。

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PASADENA, California (CNN) -- The summer has warmed up the south of Mars, melting away much of its icy polar cap.

CNN: Summer is 'sublime' in sunny south of Mars

The estimated volume of the north ice cap is about 10 times less than the minimum volume of an ancient ocean that some scientists believe once existed on Mars.

BBC: By BBC News Online Science Editor Dr David Whitehouse