[化] 轨道电子; 核外电子; 壳层电子

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(121) / 评论(0) 分类 2014年VOA慢速英语(十)月

So if you popped open the blueberry and were searching for the nucleus 如果你在蓝莓的内部搜索原子核,结果是一无所获。 You know what? It would be invisible. It's too small to see! 知道为什么吗?因为我们看不到它!它

发表于:2018-12-08 / 阅读(136) / 评论(0) 分类 TED演讲教育篇

[00:00.00]Lesson 4 Atom [00:01.95]原子 [00:03.89]The really strange thing about atoms is that most of us will never see one. [00:08.87]原子最奇特之处在于绝大多数人永远也无法看到它。 [00:13.84]Atoms are so small that it's impo

发表于:2018-12-08 / 阅读(120) / 评论(0) 分类 赖世雄学英语第四册

Virgin Spaceship Crash Raises Questions 维珍宇宙飞船失事引发诸多问题 WASHINGTON Plans to fly tourists to the edge of space could be delayed after Friday's crash of Virgin Galactic's SpaceShipTwo during a manned test flight. It is the se

发表于:2018-12-16 / 阅读(97) / 评论(0) 分类 VOA标准英语2014年(十一月)

美国火箭爆炸,私营航天产业的挫折 Wednesday's successful launch of a Russian space vehicle taking supplies to the International Space Station was in sharp contrast to the explosion of a private U.S. cargo space craft shortly after it's

发表于:2018-12-19 / 阅读(122) / 评论(0) 分类 VOA双语新闻 2014年10月

This is Scientific American's 60-Second Science. I'm Sophie Bushwick. Got a minute? The shortest distance between two points may be a straight line, but try telling that to electrons: when current flows down a wire, these particles zig and zag, movin

发表于:2018-12-24 / 阅读(176) / 评论(0) 分类 Scientific American(九)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

发表于:2019-01-02 / 阅读(266) / 评论(0) 分类 (科普英语)Earth and Sky

Forcing Electrons into Superconducting Line In a study in the journal Nature researchers created a pseudo gap, in which electrons in superconducting materials line up just before flowing resistance-free. Sonya Buyting reports Imagine a world with lev

发表于:2019-01-02 / 阅读(277) / 评论(0) 分类 60秒科学

You, today, buy gasoline miles. And we created electric miles. 现在大家买的是汽油里程。我们就创造电子里程。 And the price of electric miles ends up being a very interesting number. 电子里程价钱加起来是个有趣的数字。

发表于:2019-01-03 / 阅读(122) / 评论(0) 分类 TED演讲科技篇

So how would you run a whole country without oil? 怎么让一个国家在没有用石油的情况下运转? That's the question that sort of hit me in the middle of a Davos afternoon about four years ago. 四年以前在Davos的一个下午,这个

发表于:2019-01-03 / 阅读(123) / 评论(0) 分类 TED演讲科技篇

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(150) / 评论(0) 分类 英语新闻

VOICE ONE: I'm Phoebe Zimmermann. VOICE TWO: And I'm Steve Ember with People in America in VOA Special English. Today we tell about a man who made possible one of the most important communications devices ever created -- television. His name was Phi

发表于:2019-01-11 / 阅读(199) / 评论(0) 分类 VOA慢速英语2008年(十二)月

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(182) / 评论(0) 分类 2011年VOA慢速英语(九)月

Global Warming Could Delay Next Ice Age The next ice age could be delayed by tens of thousands of years due to excessive amounts of heat-trapping carbon dioxide in the atmosphere, which disrupts Earths natural cycle of warming and cooling, according

发表于:2019-01-13 / 阅读(143) / 评论(0) 分类 VOA标准英语2012年(一月)

With Failed Launch, US Private Space Industry Suffers Setback 火箭发射失败 美国私人航天受挫 Wednesday's successful launch of a Russian space vehicle taking supplies to the International Space Station was in sharp contrast to the explosi

发表于:2019-01-14 / 阅读(129) / 评论(0) 分类 VOA标准英语2014年(十月)

But this still doesn't explain why light is able to pass through glass rather than being absorbed as with most solids. 但是这还是不能解释为什么光可以穿透玻璃而不是像其他大多固体那样被吸收。 For that, we need to go a

发表于:2019-01-17 / 阅读(140) / 评论(0) 分类 TED演讲教育篇

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(132) / 评论(0) 分类 实用英语

PEOPLE IN AMERICA - Philo Farnsworth By Paul Thompson Broadcast: Sunday, June 06, 2004 (MUSIC) VOICE ONE: I'm Phoebe Zimmermann. VOICE TWO: And I'm Steve Ember with People in America in VOA Special En

发表于:2019-01-30 / 阅读(183) / 评论(0) 分类 People in America

By David McAlary Washington 12 July 2006 Astronaut Mike Fossum (on arm)installs the International Space Station's railcar-like mobile transporter U.S. space shuttle astronauts are on their third spacewalk since Saturday, this time to practice method

发表于:2019-02-03 / 阅读(240) / 评论(0) 分类 2006年VOA标准英语(七月)

Let us pause for a moment and consider the structure of the atom as we know it now. Every atom is made from three kinds of elementary particles: protons, which have a positive electrical charge; electrons, which have a negative electrical charge; and

发表于:2019-02-25 / 阅读(207) / 评论(0) 分类 万物简史
学英语单词
a man of means
all-wing aeroplane
amendment commission
ANRAC
atomedics
audiard
backfolding
be reconciled to doing sth
bisulphates
boring machinery
brosnans
bud groove
bugull
Clino-triphylite
coefficient of self induction
contact gear ratio
continuous velocity log
corruptible
cystic emphysema
DC DC
deacryocystis
depot non-vital power frequency circuit
detach coupons to
discounted cost
double invoices
echinococcus cyst
economical with the truth
epilemmal endings
ethylnorephinephrine hydrochloride
Euphorbia rapulum
eurylaimidaes
exhuast products
experimental subject
faatz
fibrous layer
filibuster speech
filtration ratio
fluss
free gossypol
free skin graft
fundus fluorescence photography
gel filtration
gephyrophobia
grant in kind
graystone
helius (helius) nigriceps
homocercy
hour angle-declination axis mount
hoxtons
incapacitate for/from
index minerals
infrared lenses
international relations and security networks
irizarry
Kuznetskaya Kotlovina
Lowlenthal serum
Lyman continuum
main shut off valve
manifold writer
mass-memory unit
mast climbing
multiformat camera
multiple drill head
non-evolutional
non-operculate
nonexpository
Nyalas
organication
patucidisperse system
pectic substance
pen light
phyllodia
play off
print roll coating
reading stimulation
replacement circuit
retroactive inference
Rhododendron florulentum
ring one's own bell
sand kneader
satellite lifetime
schistosity sheet
scrofulousness
seefelds
seidozerite
self-raising flour
semibatch reaction
snake's
somethin' somethin's
sound drag
sound holes
span range
stack assembly
sulphophosphate
telemetry and data processing for electrical power
time-cue
two pennies' worth
utility routines
vranov nad toplou (vranov)
wheat germ
wi
zinc blendes