Another prominent feature of Mars's surface is cratering.
火星表面的另一个显著特征是它的凹凸不平。
2
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。
3
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.