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1.polio n. 小儿麻痹症（等于poliomyelitis）；脊髓灰质炎
Polio has been virtually eradicated in Brazil.
在巴西脊髓灰质炎实际上已经根除。
2.eradication n. 消灭，扑灭；根除
The eradication of an established infestation is not easy.
根除昆虫蔓延是不容易的。
3.vaccination n. 接种疫苗；种痘
Smallpox can be contained by vaccination.
种牛痘疫苗可以控制住天花。
4.legitimacy n. 合法；合理；正统
The newspaper was directly challenging the government's legitimacy.
报纸直接质疑政府的合法性。
