BBC在线收听下载:父母往往在孩子的肥胖严重时才意识到问题

词汇讲解：

1. express vt.表达
例句：Words could not express the dull pain of these things. 
话语是无法表达这些隐痛的。 

2. resolve vt. 决定; 决心
例句：Further work is needed to resolve this contradiction. 
解决这一矛盾需要进一步研究。 

3. improve vt.提高（土地、地产）的价值; 利用（机会）; 改善，改良
例句：The city must improve its public transport. 
该城必须改善其公共交通系统。 

4. challenge n.挑战; 盘问; 质疑
例句：What did he do in reply to your challenge? 
你提出与他较量, 他作何反应? 

5. announce vt.宣布; 述说
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。 

6. recognize vt.认出; 识别
例句：I recognize that she works harder than I do. 
我认识到她比我用功。 

7. underestimate vt.低估; 对…估计不足; 看轻
例句：Don't underestimate him. He is really hot stuff. 
不要低估他,他是个不同凡响的人。