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Scientists monitor the injection of proton and ion into the Large Hadron Collider, which is 100 meters underground near Geneva, Switzerland, 23 Oct 2009 A very specialized group of scientists meets this month (July 22 - 28) in Paris for a biennial co
发表于:2019-01-13 / 阅读(146) / 评论(0)
VOA标准英语2010年(七)月
VOA标准英语2010年(七)月