VOA慢速英语:Child Vaccine Efforts Get Big Boost

词汇讲解：

1. donor n. 捐赠者,赠与者
例句：About half this amount comes from individual donors and bequests.
这笔钱大约有一半来自个人捐赠及遗赠。

2. pledge n. 信物；抵押品
例句：She left her gold bracelet as a pledge.
她留下她的金手镯作抵押品。

3. request vt. 请求, 要求
例句：We request the favour of a reply at your earliest convenience.
敬请早日赐复。

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

5. extra adj. 额外的, 外加的, 附加的
例句：The ship was loaded down with extra cargo.
船上又额外加装了货物。

6. immunize vt. 使某人免疫
例句：Everyone who is going abroad will need to be immunized against typhoid.
准备出国者均需注射伤寒预防针。

7. reduce vt. 缩减, 减少; 降低
例句：The price was considerably reduced.
价格大幅降低了。

8. lower v. (使)降低; (使)跌落
例句：We have to lower our expenses.
我们得减少开支。

9. oftentimes adv. 时常地
例句：They can finish the training oftentimes without any injuries.
他们常常能够毫发不损地完成训练。

10. prevent vt. 预防
例句：Vitamin C is supposed to prevent colds.
维生素C可以预防感冒。