随着快速应对活动，2003- 2005年再次受到感染的21个以前无脊髓灰质炎国家均已制止其暴发或准备这样做。

With speedy response activities, 21 previously polio-free countries that were re-infected in 2003-2005 have all either stopped their outbreaks or are about to do so.

youdao

随着快速应对活动，2003- 2005年再次受到感染的21个以前无脊髓灰质炎国家均已制止其暴发或准备这样做。

With speedy response activities, 21 previously polio-free countries that were re-infected in 2003-2005 have all either stopped their outbreaks or are about to do so.

youdao