Genes is a large part of autism, but it's not the whole story. Non-genetic factors are also important, but we don't know exactly what they are.

基因遗传是自闭症的一个大的病因，但并不是所有。非遗传因素也起了很大作用，但我们还不知这些因素有哪些。

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An epigenetic event is when non-genetic factors cause a gene to change its expression, and this is different from cancer caused by mutated genes that produce errant protein.

表观遗传是指非遗传的因素(译者注：dna序列不发生改变)引起基因表达的改变，这与基因突变导致翻译出错误蛋白有明显的区别。

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Stereotypies as quantitative trait that are affected by both multiple genetic loci and non-genetic factors may be controlled by the possible presence of one or more major genes.

行为规癖作为受多基因座位和非遗传因素共同作用的数量性状，不仅受微效多基因的影响，也可能受一个或几个主基因的影响。

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However, there are a few noteworthy exceptions - for example, age-related macular degeneration - where the genetic risks explain a substantial proportion of the disease and which , when combined with other non-genetic factors, might be able to accurately identify individuals who will develop the disease in future.

BBC: Has decoding the genome lived up to hype?

It was more common for identical twins to both have Alzheimer's compared to non-identical, and a statistical analysis of risk rates in the groups gave the researchers their estimate of how significant genetic factors are.

BBC: NEWS | Health | Alzheimer's risk 'is 80% genetic'