北京—近五年来最严重的干旱使中国的地下水严重不足。
Beijing - It is not just the worst drought in five decades that makes China reel under water insufficiency.
由于地下水位下降，灌溉井干涸，居于世界之首的中国小麦产量，已经从1997年1.23亿吨的峰值下降了8%。
As water tables have fallen and irrigation wells have gone dry, China's wheat crop, the world's largest, has declined by 8% since it peaked at 123 million tons in 1997.
中国、俄罗斯和美国的科学家测量地下水的氡含量。
Scientists in China, Russia, and the United States measure radon in ground water.
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