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Even gullies and dry stream beds may have water just below the surface .

甚至峡谷和干涸的河床表面以下也可能有水。

The gullies may have been carved by liquid water millions of years ago , when mars was warmer and wetter .

这些水沟可能是几百万年前由液态水冲刷而成，那个时候的火星要比现在更加温暖和湿润。

Air-cushion vehicles can travel above water with waves reaching 4 m in height , two-meter deep gullies and two-meter high bushes . Travelling over bogs is also possible .

气垫船能在浪高四米的水面上行驶，两米深的沟壑、两米高的灌木丛甚至沼泽地带也都可以通行。

Farmers frequently level off such gullies after harvesting in the fall , he said , and then replant the same low-lying areas year after year , leaving them susceptible to further erosion .

他说，农民常常会在丰收之后的秋天铲平这些深沟，然后年复一年地在这些同样低洼的地区反复耕种，这就进一步加重了土地侵蚀。

Other scientists have said images and computer simulations strongly suggest a landslide of sand and gravel are more likely explanations for the bright deposits in gullies that have been proposed as strong evidence of water flow .

其他科学家们说图像和计算机模拟强烈表明滑坡的沙石更有可能解释溪谷里明亮的储藏，这已经被提议作为一个强有力的水流量的证据。