VOA慢速英语:Efforts to Stop Polio Continue

词汇讲解：

1. defeat vt. 击败, 战胜
例句：Our football team defeated theirs this time.
这一次我们的足球队胜了他们的足球队。

2. philanthropist n. 慈善家
例句：His father was a philanthropist.
他的父亲是一个慈善家。

3. vaccine n. 疫苗
例句：She takes a vaccine against influenza every fall.
她每年秋季接种流感疫苗。

4. entrant n. 参加者
例句：The winning entrant received tickets to the theatre.
获胜者得到了剧院的入场券。

5. symptom n. 症状
例句：The doctor told her to watch out for symptoms of measles.
医生叫她注意麻疹出现的症状。

6. crutch n. 拐杖
例句：When he broke his leg he had to walk on crutches.
他腿摔断了以后, 不得不靠拐杖走路。

7. stoppage n. 停止, 中止
例句：All these stoppages are costing the company a fortune.
所有这些罢工事件使公司损失了一大笔财富。

8. reduction n. 减少, 缩小; 减少的量, 降价
例句：The reduction in white blood cell counts lowers resistance to disease.
白细胞总数的减少, 会降低对疾病的抵抗力。

9. infection n. 传染, 感染
例句：She has got an ear infection.
她的耳朵感染了。

10. mutate v. (使某物)变化, 转变, 突变, 变异
例句：Scientists warn that the virus could mutate into a much deadlier form .
科学家们警告，该病毒可能变异成更致命的形式。

11. permanent adj. 永久(性)的
例句：He is one of our permanent employees.
他是我们的终身雇员之一。

12. disastrous adj. 灾难性的, 造成灾害的
例句：Carelessness in driving often results in disastrous accidents.
驾驶不慎常带来不幸的意外。