BBC在线收听下载:奥巴马宣布将投资非洲数十亿美元

词汇讲解：

1. eliminate vt. 消除，淘汰
例句：Can the government eliminate poverty? 
政府能消除贫穷吗? 

2. persuade vt. 说服，劝说
例句：I was ready to move heaven and earth to persuade my sister. 
我拼上老命也要说服我的妹妹。 

3. estimate vt. 评估
例句：You estimate his intellect too highly. 
你把他的智力评估得太高。  
 
4. announce vt. 通知，宣布
例句：Please announce to the children that there will be no school this afternoon. 
请通知孩子们今天下午不上课。 

5. arrest vt. vt.逮捕，拘捕；止住，阻止，抑制
例句：Attempts are being made to arrest the spread of the disease. 
现正设法遏止这种疾病的蔓延. 

6. pledge n.保证，誓言
例句：He would keep his pledge to the utmost of his power. 
他将极力信守他的誓言。 

7. restore vt.归还；交还；使恢复
例句：By doing this, they may at times be helping to restore competition. 
这样一来，他在某些时候，有助于竞争的加强。 

8. rescue vt.营救，救援
例句：His fearless rescue saved five lives. 
他勇敢地救了三个人的性命。