单词：caesium atomic clock
单词：caesium atomic clock 相关文章
Five Minutes to Midnight 滴！答！滴！毁灭倒数计时 by Kevin Lustig The University of Chicago publishes the Bulletin of the Atomic Scientists, a magazine about topics related to nuclear technology. On the cover of every issue of the magazin
常春藤解析英语
[00:06.37]The United States has a new official clock. [00:10.95]The clock began operating late last year in the American city of Boulder,Colorado. [00:18.39]Experts say the new clock is so exact that it will neither gain nor lose so much as one secon
美国英语听力80篇
Scientists say the world has edged closer to apocalypse in the past year amid a darkening security landscape and comments by Donald Trump. 科学家们表示，过去一年，随着暗淡的安全环境和唐纳德特朗普的言论，世界已经逐渐
英语新闻
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
Scientific American(八)月
Doomsday Clock Moves Forward末日钟被调前 Efforts to rid the world of nuclear weapons continue to meet obstacles, and that is one main reason why the Bulletin of the Atomic Scientists moved the Doomsday Clock forward to five minutes to midnight.
VOA标准英语2012年(一月)
By Stephanie Ho Washington 17 January 2007 watch Doomsday Clock report An international group of atomic scientists is warning of the dual threats to the world posed by nuclear weapons and climate change. VOA's Stephanie Ho reports from Washington. K
2007年VOA标准英语（一月）