地表之下5公里的地下水中也发现了微生物群落。
Communities of microorganisms have been found hunkered down in groundwater as far as 5 km below the surface of the land.
火星稀薄的大气层不足以抵挡致命的太阳光辐射。但是地表之下，可能生活着微生物。
The puny atmosphere on the planet is not strong enough to shield the planet against lethal solar radiation, though microbes could potentially exist beneath the surface.
据科学家推测，土卫二冰冷的表面99%被水冰覆盖，地表之下存在液态水的几率也很大。
The surface of the icy moon is thought to be about 99 percent water ice, with a good chance of liquid water beneath.
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