他们的语言问题仅仅是因为DNA中一个核苷酸发生了改变，也就是说基因序列中有一个字母被改写了。
Their trouble with language had been caused by the change of a single nucleotide of dna-just one letter in the genetic sequence.
因为忽视对孩子的照顾，一个鼠妈妈可能永久的改变它后代基因。
By the simple act of neglecting her young, a mother rat could permanently change the expression of genes in her offspring.
现在，动物实验显示，这可能是因为酒精以化学方式改变了胎儿dna，影响了基因表达。
Now experiments in mice suggest this may be because alcohol chemically alters the fetus's DNA, affecting how genes are expressed.
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