在巴西脊髓灰质炎实际上已经根除。Polio has been virtually eradicated in Brazil.脊髓灰质炎疫苗挽救了数以百万计的生命.The polio vaccine has saved millions of lives.1995年,已消灭脊髓灰质炎.By 1995 poliomyelitis had been totally eliminated....
She cast a sidelong glance at Fern.她瞟了一眼弗恩.There are many different types of fern, none of which produce flowers.蕨类植物有许多不同的种类, 无论哪一种都不长花.Kennicott was cordial to Fern Mulins.肯尼科特对弗恩马林斯小姐倒是很亲热....