单词：international earth rotation service (iers)
单词：international earth rotation service (iers) 相关文章
US Air Force Has Severe Shortage of Pilots 美国空军飞行员的严重短缺 The United States Air Force is reporting a shortage of pilots of fighter airplanes. The lack is so severe that some generals say it may affect the services ability to car
2016年VOA慢速英语(十一)月
CNN News from here Atlanta, Georgia straight to your classrooms, Im Carl Azuz, this is CNN Student News. Today were starting something called a payroll tax. Heres the deal on the payroll tax from A to Z. Americans have been getting a break on their f
CNN2011年(十二)月
Galactic Rotation 银河系自转 Astronomers calculate there is ten times more matter in our Milky Way galaxy than we can actually see. Discover how the orbital motions of stars in the galaxy reveal dark matter -- on today's Earth and Sky. JB: I'm Joel
(科普英语)Earth and Sky
Airlines, trading floors and technology companies are braced for chaos today as world timekeepers prepare to add a leap second to global clocks. 世界钟表今天要给全球的钟表加一闰秒，因此航班、交易所、科技公司正在为即将
阅读空间
Easily confused by this idea, there has a big thawed iron inner core, so that I think it's just the bar magnet, just permanent magnet frozen in nad, and that's where causes all the magnetic field. But it's too hot inside the Earth, that can't happen
自然百科2011年
Earth's days are getting longer but you're not likely to notice any time soon it would take about 6.7 million years to gain just one minute, according to a study published last Wednesday. 据上周三公布的一份报告显示，地球的白天时间正
英语新闻