The polio vaccine has saved millions of lives.
脊



苗挽救了数以百万计的生命。



,小儿麻痹症医>
苗;
;
苗;The polio vaccine has saved millions of lives.
脊



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
苗。
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