polio

Before the vaccine was developed in the 1950s, polio caused thousands of children to become paralyzed.

(Chinese) 在20世纪50年代疫苗研制出来之前，脊髓灰质炎导致成千上万的儿童瘫痪。

Public health officials are working hard to completely eradicate polio from the remaining few countries.

(Chinese) 公共卫生官员正致力于从剩下的少数几个国家中彻底根除脊髓灰质炎。