颜色差异可能提供土卫一表面组成的线索以了解其动荡的历史。
The color difference could yield surface composition clues to the violent history of Mimas.
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.
对人眼来说,土卫五的结冰的表面应该看上去非常单调。
To human eyes, the icy surface of Saturn's moon Rhea would appear fairly monotone.
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