单词:trochoidal focusing mass spectrometer
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THIS IS AMERICA - Six Men, a World War, a Pacific Island, and an Image for All Time The story of the flag raising captured in 1945 on Iwo Jima by Associated Press photographer Joe Rosenthal, and the memorial statue it led to. Transcript of radio bro
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VOA标准英语2013--The Iwo Jima Memorial in Arlington, Virginia and the Famous Photograph that Inspired It
The Iwo Jima Memorial in Arlington, Virginia and the Famous Photograph that Inspired It From VOA Learning English, welcome to This Is America. I'm Steve Ember. Visitors to Washington, DC know about such tourist attractions as the Lincoln and Jefferso
BEIJING, Aug. 14 (Xinhua) -- Kai-Tak, the 13th tropical storm of the year, is approaching China's southern regions, the country's meteorological authority forecast Tuesday. Kai-Tak, moving northwest at a speed of 15 to 20 km per hour, will graze or l