单词：zsigmondy's ultrafilter
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By David McAlary Washington 28 February 2007 watch Barry Unger HPV report A sexually-transmitted virus that is a leading cause of female cancer deaths in developing countries is also very prevalent in the United States. It is the human papillomaviru
2007年VOA标准英语（二月）
One of the world's most amazing migration is about to begin in earnest: 300 million monarch butterflies spread across North America are about to converge on small forests in the mounts of Mexico. This year, the butterflies have an unusual company as
2005年NPR美国国家公共电台
STEVE INSKEEP, HOST: The BBC series Planet Earth was one of the first blockbuster high-definition TV shows a decade ago. Tomorrow, Planet Earth II debuts on BBC America. And this time, it is said to be in ultrahigh def. Reporter Will Huntsberry found
2017年NPR美国国家公共电台2月
China has long depended on coal-burning power plants to fuel its explosive growth over the past three decades. As a result, air pollution has risen to alarming levels in central and eastern regions. Policymakers have been working hard to shift the co
2017CRI中国国际广播电台
By Matt Steinglass Hanoi 04 April 2006 Dao Dinh Binh (File photo - Dec. 4, 2003) Vietnam's transportation minister has resigned to take responsibility for a huge gambling scandal, and a vice minister
2006年VOA标准英语（四月）
The Oyster's Mighty Comeback Is Creating Cleaner U.S. Waterways ELISE HU, HOST: Oyster farms are rapidly sprouting up along America's eastern shoreline. Production doubled in just the past six years, driven by the farm-to-table movement. As Delaware
2016年NPR美国国家公共电台8月