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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Carbonaceous chondrite planetesimals were adsorbed on the mantle surface of the primitive earth, forming primitive carbon-rich areas.

碳质球粒陨石星子被吸积于原始地球上地幔表层，形成原始富碳区。

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Archaeopteryx, supposedly the oldest and most primitive bird on Earth, might not have been a bird after all, scientists say.

科学家们说，据称是地球上最古老最原始的鸟类的“始祖鸟”可能根本就不是一只鸟。

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On Oct. 4, 1957, a primitive, 100-pound metal ball was sent hurtling into orbit around Earth, beeping back radio signals like taunts.

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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'