口吃一直被认为是家族遗传疾病，科学家终于找到了三种可能造成某些人出现口吃的基因。
Stammering has long been recognised to run in families, but scientists now say they have identified three genes which may cause the problem in some people.
先天性纤维化症候群是一少见的家族性遗传疾病。
Congenital fibrosis syndrome is a rare familial hereditary disease, characterized by fibrotic change of extraocular muscles.
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