比如说土卫六探索号将会用到至少是原始的方法来研究同早期行星——地球出现生命时情况相似的地方。
The Titan explorer, for example, will be studying a place that - in a crude way, at least - resembles the early planet Earth at a time when life arose here.
一个新的计算模型说明了在太阳系统是怎样阻止年轻的地球和其他早期行星螺旋形地下沉到太阳里去，从而使它们能够安全地保存下来。
A new model keeps the solar system safe for the young Earth and other infant planets by preventing them from spiraling into the sun.
复杂的生命在地球表面进化，而不是在火星或太阳系的其他行星上，因为在那些行星上，早期的地表生命被紫外线杀死了。
Complex life evolved on the Earth's surface, but not on Mars or other planets in the solar system because on those planets, early surface life was killed by UV radiation.
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