Images of the Martian surface reveal many hundreds of volcanoes.
火星表面的图像显示出了数百座火山。
Space-probe photographs indicate the existence of giant volcanoes on the Martian surface.
太空探测照片显示火星表面存在巨大的火山。
As on the Moon, the extent of large impact cratering serves as an age indicator for the Martian surface.
和在月球的一样，大型撞击陨石坑的范围之广可以显示出火星表面的年龄。
Other researchers go even further, suggesting that the data provide evidence for large open expanses of water on the early Martian surface.
其他研究者取得了进一步成果，他们认为，这些资料证明了在早期的火星表面上存在大片开阔的水域。
As on the Moon, the extent of large impact cratering (i.e. craters too big to have been filled in by erosion since they were formed) serves as an age indicator for the Martian surface.
与月球上相同，那些巨大陨石坑的范围（例如，那些巨大到自形成后尚未被尘埃填满的陨石坑）标志着火星表面的年龄。
The great height of Martian volcanoes is a direct consequence of the planet's low surface gravity.
地球表面低重力直接导致了火星上火山的巨大高度。
The great height of Martian volcanoes is a direct consequence of the planet's low surface gravity.
地球表面低重力直接导致了火星上火山的巨大高度。
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