科学60秒:
2011 is the International Year of Chemistry. So scientists at the national meeting of the American Chemical Society in Anaheim ___1___. (Or a beaker.) And they celebrated as only chemists can—by...
科学60秒:多年担忧终应验
“The type of accident that is occurring in Japan is known as the ___1___: loss of off-site AC power—power lines are down—and then a subsequent failure of emergency power on-site, the diesel ge...
科学60秒:热带雨林坍塌,爬行动物激增
The November 26th issue of the journal Science included a study showing that the extinction of the dinosaurs some 65 million years ago allowed ____1____ mammals to get really big. But well before
美国内战
美国内战The American Civil War The military aspect of the United States Civil War has always attracted the most attention from scholars. The roar of gunfire, the massed movem...