囊肿性纤维化在美国是最常见的致命性遗传疾病。

Cystic fibrosis is the most common fatal genetic disease in the United States.

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而在检测到的肿块中，80%至85%都是良性的，它们通常都是囊肿或是非癌肿瘤，这称为纤维腺瘤。

And among lumps that are detected, 80 to 85% are benign. They're often cysts or noncancerous tumors called fibroadenomas.

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他和他妻子已经有了一个患囊肿性纤维化症的孩子，今天又得知将于今年晚些时候出生的第二个孩子几乎肯定患有唐氏综合症。

He and his wife, already parents of a child with cystic fibrosis, had gotten word that their second baby, due later this year, would almost certainly have Down syndrome.

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