cystic fibrosis 囊性纤维变性是一种非感染性遗传疾患，在出生之后不久或在幼年时期发病。特征是呼吸道反复受感染，胰腺制造不出消化与吸收食物所需的酶，尤其是消化脂肪的酶。患者的呼吸道内产生稠厚的粘痰，阻碍呼吸，引起阵阵剧烈咳嗽，呼吸急促。患者胰腺功能受损，造成生长阻遏，排出大量白色恶臭粪便，大量氯化钠(盐分)随汗液丢失。
患有囊性纤维变性的人却无法抵抗这种细菌，即使他们的肺部能产生正常数量的抗生素。
People with cystic fibroses are unable to fight off such bacteria, even though their lungs produce normal amounts of the antibiotic.
囊性纤维变性是一种严重的遗传性疾病，影响小渠道，使营养物质进出细胞。
Cystic fibrosis is a serious inherited disease that affects tiny channels that bring nutrients into and out of cells.
但这真的是第一次吗？克隆与改造胚胎的基因以消除象囊性纤维变性这样的基因疾病真的是有天壤之别吗？
But is it really the first time? Is cloning all that different from genetical ly engineering an embryo to eliminate a genetic disease like cystic fibrosis?
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