单词：organoytterbium
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This is the VOA Special English Health Report. A.D.H.D. is attention deficit hyperactivity disorder. Government estimates say three to seven percent of school-age children in the United States have it. Adults can also have it. People with A.D.H.D. ha
发表于:2018-12-16 / 阅读(71) / 评论(0)
2010年VOA慢速英语(五)月
2010年VOA慢速英语(五)月
Youve given some thought to oxygen, carbon, uranium. But youve probably never mused about the element ytterbium, symbol Yb. A new study by scientists at the National Institute of Standards and Technology, or NIST, says that ytterbium could find a rol
发表于:2019-01-08 / 阅读(90) / 评论(0)
Scientific American(八)月
Scientific American(八)月