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。

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The Mariner spacecraft found that the surface of Mars, as well as that of its two moons, is pitted with impact craters formed by meteoroids falling in from space.

水手号宇宙飞船发现火星表面，还有它的两个卫星表面，都有由太空坠落的流星体造成的陨石坑。

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The impact of raindrops on the loose soil tends to transfer fine clay particles into the tiniest soil spaces, sealing them and producing a surface that allows very little water penetration.

降水往往会把细小的粘土颗粒转移到土壤的最微小的空隙中，使这些空隙变得封闭，从而形成了一种几乎不允许任何水分渗透下来的表层土壤。

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But as Sail to Prevail CEO Paul Callahan got into it, he strengthened his own leadership skills to go beyond the surface and impact people in ways they never expected.

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The television pictures on board were designed to begin operating when the rocket came within 2, 500 miles (4, 023km) of the lunar surface - 40 minutes before impact - and then send an image of the Moon back to Earth every 13 seconds.

BBC: 1962: First US rocket lands on Moon

We expect the Surface pads to have a similar impact on the PC industry as the Zune did in portable music players, ' commented Canalys Analyst Tim Coulling.

ENGADGET: Canalys: PC and tablet shipments hit new high in Q2 with Apple in the lead, HP next in line