有关生命的起源有多种学说。

There are many theories about the origin of life.

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这位生物学家提出一种有关生命的新理论。

The biologist advanced a new theory of life.

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这位生物学家提出了一个有关生命的新学说。

The biologist advanced a new theory of life.

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And he has a theory about early life and perfectly appropriate as far as one can tell of what pre-human form he studied.

他有一个有关早期生命的理论,一般人都会觉得很正常,他研究人类之前的生命形式没有什么不合适。

普林斯顿公开课 - 人性课程节选

So, these are all the fundamentals that are involved in chemistry that relate to physical chemistry, organic chemistry, inorganic chemistry, biological chemistry, and are a solid foundation for studying any kind of life science.

所必须知道的最基本的化学知识,这些都是和物理化学,有机化学，无机化学，生物化学有关的基础知识,也是学任何生命科学的基础。

麻省理工公开课 - 化学原理课程节选

Now, the most natural thing to suggest would be, well, you get clear on your favorite theory about the value of life, whatever that is.

现在，提出的最自然的事情就是，你弄明白你最喜欢的,有关生命价值的理论，不管是什么。

耶鲁公开课 - 死亡课程节选