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Polio Vaccination Efforts in India Focus on Convincing Paren

Steve Baragona Polio is on the ropes. A $3 billion global campaign has driven the crippling and sometimes-fatal disease to just six source countries. Experts say the campaign has the potential to win

发表于:2019-01-31 / 阅读(122) / 评论(0) 分类 VOA2004（上）--国际时事
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