As a result, relatively primitive surface features are preserved for study and analysis.

其结果是相对原始的地表特性得以保存可供研究和分析。

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From these studies, scientists have concluded that the surface of the primitive Earth was covered with oceans containing the molecules fundamental to life.

从这些研究中，科学家们得出结论，海洋覆盖着原始地球的表面，其中含有构成生命的基本分子。

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Even if Earth's surface were not actually sterilized by this bombardment, it is unlikely that any but the most primitive life-forms could have survived.

即使地球表面并没有被这种轰炸所灭绝，但除了最原始的生命形式之外，几乎不可能有其他生命形式幸存下来。

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The spacecraft's data indicates the asteroid has a very primitive surface - rather like the chondritic meteorites that are sometimes picked up on Earth and which are assumed to have come from bodies that experienced no melting or differentiation.

BBC: A fleeting encounter with an 'inbetweener'