而部分原因要归结为——遗传：有30种不同的基因可增高克罗恩病的易感性，但也并非每一个拥有这种基因的人就会得克罗恩病。
And heredity is partly to blame: some 30 different genes enhance susceptibility. But not everyone who has the genes gets Crohn's.
而部分原因要归结为——遗传：有30种不同的基因可增高克罗恩病的易感性，但也并非每一个拥有这种基因的人就会得克罗恩病。
And heredity is partly to blame: some 30 different genes enhance susceptibility. But not everyone who has the genes gets Crohn's.
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