The polio vaccine has saved millions of lives.

脊髓灰质炎疫苗挽救了数以百万计的生命.

《简明英汉词典》

Those cases, however, were caused by the polio vaccine itself.

但是, 这些病例是由小儿麻痹疫苗本身引起的.

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Both cases however were caused by polio vaccine itself.

但是,这些病例都是由疫苗本身引起的.

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Q: How much does polio vaccine cost?

问: 小儿?痹疫苗的费用是 多少 ?

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There are two kinds of polio vaccine.

有两种小儿麻痹症的疫苗.

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He failed many times but he finally broke through to find a successful polio vaccine.

他失败了许多次,但终于发现了有效的预防小儿麻痹症的疫苗.

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