会议忙人-小布什(2)
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科学60秒:土星环——卫星的残迹
Galileo first ______1_____ Saturn’s rings 400 years ago. But since then, scientists have ______2_____ how they got there. Because the rings are almost pure water ice—and material in the outer s...
奥巴马说宗教信仰支撑着他
VOAIn remarks at the annual National Prayer Breakfast in Washington, President Barack Obama said challenges he has faced during the past two years, including the U.S. economic recession, have str
整洁的农场 远离乳腺癌 (2)
Ynte Schukken SchukkenThe same is true for milking machines, milking areas and pasture lands -- the cleaner the better, he says. Milkers should always wash their hands. And, in the United States,...
肺结核研究的新进展 (2)
Ajit Lalvani ELISpot Daniel Hoft MissouriAjit Lalvani from Imperial College London led an international team in developing the blood test, called ELISpot. A study showed that the ELISpot blood te...