The polio vaccine has saved millions of lives.
灰
炎疫苗挽救了数以百万计的生命。
灰
炎,小儿麻痹症
感冒;The polio vaccine has saved millions of lives.
灰炎疫苗挽救了数以百万计的生命。
She was struck down by polio at the age of four.
她四岁那年因小儿麻痺症死去。
Children have been routinely immunized against polio since 1958.
自从1958 年以来，儿童都按照常规接种防治小儿麻痹症的疫苗。
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