可以将基因看做细胞生长与行使功能的说明书。
Think of your genes as an instruction manual for cell growth and function.
一部发动机有很多部件，各自行使不同的功能。
An engine has many parts, each performing a different function.
倘若人类的喉部不行使任何功能，它便不会进化。
The larynx of a human being did not evolve without having some function.
倘若人类的喉部不行使任何功能，它便不会进化。
The larynx of a human being did not evolve without having some function.
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