六氟硅酸铁(II)

美国空军飞行员的严重短缺

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

发表于:2018-12-16 / 阅读(124) / 评论(0)

2016年VOA慢速英语(十一)月

Earth and Sky:Galactic Rotation 银河系自转

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

发表于:2019-01-02 / 阅读(129) / 评论(0)

(科普英语)Earth and Sky

电信专业英英词典G-1

Gain - This is an increase in signal power, due to a boost from an electronic device. Garbage - These are unwanted characters that appear because of either incorrect settings or noise. Gate - These ar

发表于:2019-01-03 / 阅读(57) / 评论(0)

电信英语

全球钟表今日将加“一闰秒”

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

发表于:2019-01-16 / 阅读(71) / 评论(0)

阅读空间

英语听力：自然百科地球力场 Earth's Force Field—8

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

发表于:2019-01-22 / 阅读(46) / 评论(0)

自然百科2011年

英语听力：探索发现 2014-07-20 BBC 地平线：陨石的真相-30

It came in in the daytime sky out of the Sun. Weve got telescopes looking out there for these objects, but they only work at night. Radar doesnt help either because to really use radar to find these objects above the atmosphere, you have to know exac

发表于:2019-01-23 / 阅读(43) / 评论(0)

探索与发现2014年

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antiketogenic substance