Sent_en: 2zh An extensive vaccination campaign across 19 West and Central African countries is to begin today in an attempt to stem a year-long polio epidemic in the region.
Sent_yy: 今天将在西非和中非19个国家开始大规模疫苗接种运动，试图遏制该地区持续一年的脊髓灰质炎流行。