现代生物化学与人类遗传学相互渗透，从分子水平探讨基因变化，从而进行诊断和治疗。

Modern biological chemistry saturates human hereditism each other. Genetic changes are studied from molecule level in order to do treatment.

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复活节岛上土壤中的一种微生物产生的化学物质在亿万年的演变中，本应与人类没有直接关系。

A tiny molecule harvested from a soil bacterium on Easter Island that evolved billions of years ago for no obvious purposes should have nothing to do with human beings.

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复合胺是一种大脑中与人类感情有关的化学成分。

Serotonin is a brain chemical closely associated with mood.

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