VOA慢速英语:Sri Lankan-American Gives Back to Home Country

词汇讲解：

1. population n.人口; 全体居民
例句：What is the proportion of men to women in the population? 
人口中男女的比例是多少? 

2. approach vt. 接近，走近
例句：Her nearer approach made the guess a certainty. 
她走得更近了，猜想被证实了。 

3. change vt.改变，变更
例句：People like to change things around to suit themselves. 
人们喜欢改变周围的事物，使之适合自己。 

4. examine vt.检查，调查
例句：The doctor examine the patient carfully. 
医生对这位病人作了仔细检查。 

5. prevent vt.预防; 阻碍
例句：He has determined that nothing will prevent him. 
他已决心不顾一切阻碍。 

6. expand vt.使…变大; 扩张
例句：I want to expand the medical program and the recreation program. 
我要扩充医药工作和康乐活动。 

7. afford vt.买得起; 担负得起; 提供
例句：Few could afford the luxury. 
很少有人买得起这种奢侈品。