疫苗让我们根除了天花，几乎根除了小儿麻痹症，从麻疹、白喉、破伤风和其他致命致残疾病手中拯救了数百万儿童。
Vaccines have eradicated smallpox, pushed polio to the verge of eradication, and saved millions of children from measles, diphtheria, tetanus, and other deadly and disabling diseases.