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。

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

youdao

相反，“原始汤”的小有机分子也可能是从太空抵达地球的。

Conversely, the prebiotic soup of small organic molecules may have arrived from space.

youdao

具体来说，有关的细胞是负责制造多巴胺的原始化合物，多巴胺是在产生满足感中充当重要角色的信号分子。

Specifically, the cells in question were the ones responsible for making the precursors of dopamine, a signalling molecule with a well-established role in generating the sensation of pleasure.

youdao