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A schoolgirl aged 11 has been honoured as "America's top young scientist" for inventing a quick, low-cost test to detect lead-contaminated water. 一名11岁的女学生因发明了一个快速、廉价测试铅污染水的方法，而被誉为“美国顶尖青年科学家”。 Gitanjali Rao was selected from 10 finalists who had spent three months collaborating with scientists to develop their ideas. Gitanjali Rao是从10名参加决赛的选手们中被选出来的，他们花了三个月的时间与科学家们进行合作，来实现自己的想法。 Her device uses carbon nanotubes to detect the presence of lead. Thousands of US water systems are reportedly contaminated by lead. 她的设备使用了碳纳米管来检测铅的存在。据报道，数千个美国供水系统都有铅污染的问题。 | 
