The polio vaccine has saved millions of lives.
脊髓灰
炎疫苗挽救了数
百万计的生命。
炎,小
麻痹症医>
;
;The polio vaccine has saved millions of lives.
脊髓灰
炎疫苗挽救了数
百万计的生命。
She was struck down by polio at the age of four.
她四岁那年因小
麻痺症死去。
Children have been routinely immunized against polio since 1958.
自从1958 年
,
童都按照常规接种防治小
麻痹症的疫苗。
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