自闭症是不同条件的集合——他们有可能是遗传和环境风险的组合。

ASDs are a varied set of conditions - and they may well have combinations of genetic and environmental risks.

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从生命开始使用遗传密码到现在，核苷酸的四个字母的三重组合有64个可能，这些遗传“字词”被称为密码子。

In the genetic code that life has used up to now, there are 64 possible triplet combinations of the four nucleotide letters; these genetic "words" are called codons.

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有些人有两种“长的”启动基因(一个是从一位双亲中遗传而来)，启动基因是一种减少神经元连接处的血清胺数量的组合体。

Some people had two "long" versions of the promoter gene (one inherited from each parent), a combination that reduces the amount of serotonin in the junctions between nerve cells.

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