Cystic fibrosis is an example of a disease where you just have a bad ingredient and you have a disease, and we can actually make a direct correspondence between the ingredient and the disease.
囊性纤维化就是这类病的一个例子， 只要一个“佐料”坏了就能发病， 这里我们真能在基因和疾病间 建立直接的联系。