单词:periodontologist
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This is Scientific American's 60-Second Science, I am Karen Hopkin. This'll just take a minute. Biologists, traditionally track migrations by tagging animals with devices that allow their movements to be monitored. But Homo sapiens can't be fitted wi
AS IT IS 2013-07-12 2000 to 2010: A Period of "Unprecedented" Weather Extremes, Scientists Say From VOA Learning English, this is As It Is. Welcome to the show. Im Caty Weaver. Today, two reports about the environment. One explores climate condit
By Carol Pearson Washington, DC 08 November 2006 watch Heart Stent report Heart stents are lifesaving medical devices that help prevent heart attacks. Most of these stents are coated with various drugs, but mounting data suggest drug-coated stents c
JOHANNESBURG, Sept. 12 (Xinhua) -- The Sharks rugby(英式橄榄球) team from Durban remained eight points clear with 41 points at the top of the log after the 10th week of South Africa' s Currie Cup rugby competition on Sunday. Their nearest ri