最外层轨道电子

VOA慢速英语2014 火箭爆炸后美国国家航空航天局面临的问题

Questions for NASA after Rocket Explosion 火箭爆炸后美国国家航空航天局面临的问题 Unmanned Antares rocket is seen exploding seconds after lift off from a commercial launch pad in this still image from NASA video at Wallops Island, V

发表于:2018-12-08 / 阅读(40) / 评论(0)

2014年VOA慢速英语(十)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

美国私企飞船与空间站对接

美国私企飞船与空间站对接 WASHINGTON, Jan. 12 (Xinhua) -- A commercial spacecraft, operated by U.S. space company Orbital Sciences Corp., docked with the International Space Station (ISS) on Sunday morning on its first official cargo resup

发表于:2019-01-09 / 阅读(55) / 评论(0)

英语新闻

VOA慢速英语2011--Space Junk Threatens Earth’s Orbital E

SCIENCE IN THE NEWS - Space Junk Threatens Earths Orbital Environment JIM TEDDER: This is SCIENCE IN THE NEWS, in VOA Special English. Im Jim Tedder. KATHERINE COLE: And Im Katherine Cole. Today, we tell about an ever increasing number of objects in

发表于:2019-01-12 / 阅读(81) / 评论(0)

2011年VOA慢速英语(九)月

双语：太空垃圾数量已达“临界点”

The amount of debris orbiting the Earth has reached a tipping point for collisions, which would in turn generate more of the debris that threatens astronauts and satellites, according to a US study released on Thursday。 NASA needs a new strategic p

发表于:2019-01-30 / 阅读(47) / 评论(0)

实用英语

万物简史第206期:威力巨大的原子(20)

What this means in practice is that you can never predict where an electron will be at any given moment. You can only list its probability of being there. In a sense, as Dennis Overbye has put it, an electron doesnt exist until it is observed. Or, pu

发表于:2019-02-17 / 阅读(24) / 评论(0)

万物简史

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学英语单词

acid refining

Alcan Highway

alternaria nigrescens

Camellia oligophlebia