VOA慢速英语:US Students Built Robot to Uncover Submerged Unexploded Mines

词汇讲解：

1. challenge n.挑战; 盘问; 质疑
例句：Mother's voice held a challenge of stubborn exactitude. 
母亲的声调里有固执而针锋相对的挑战意味。

2. measure vt.测量; 估量
例句：The aerovane is frequently used to measure windspeed. 
风向风速仪经常用来测定风速。 

3. supervise vt. 监督; 管理; 指导
例句：She supervise six girls in the account department. 
她在财务部门管六个女孩。 

4. component n.成分; 零件
例句：It was made into a collapsible component. 
它被制成一可伸缩的部件。 

5. identification n.鉴定，识别
例句：I used my driver's license as identification. 
我用驾驶执照作为身份证明。