单词：solid state laser material
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North Korea Trying to Make Succession Look Solid North Korea's efforts to solidify Kim Jong Un as the communist nation's new supreme leader appear to be intensifying. North Korea's state-run media Tuesday released video of the new leader rallying tro
VOA标准英语2012年(一月)
The White House says it doesnt want Americans to stop traveling just to be vigilant about their personal security. As NPRs Scott Horsley reports, the Obama administration is trying to tamp down fears a day after it warned US citizens in Europe of the
2010年NPR美国国家公共电台10月
By David Gollust State Department 10 May 2007 U.S. Secretary of State Condoleezza Rice said Thursday the concentration of political power in the Kremlin under Russian President Vladimir Putin is troubling, though adding that Washington and Moscow are
2007年VOA标准英语（五月）
JUDY WOODRUFF: When it comes to the battle against the Islamic State, much of the world's attention is focused, of course, on the murders and the mayhem it has wrought. But there have also been a series of attacks on antiquities and cultural heritage
PBS访谈社会系列
There is a new substance that is harder than diamond. It's called Q-carbon, and it was created by researchers at North Carolina State University. 北卡罗莱纳州立大学的研究人员研发出一种名为Q-碳的新物质，其硬度比钻石还高
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There is a new substance that is harder than diamond. It's called Q-carbon, and it was created by researchers at North Carolina State University. 北卡罗莱纳州立大学的研究人员研发出一种名为Q-碳的新物质，其硬度比钻石还高
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