自由电子密度

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(92) / 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(84) / 评论(0) 分类 赖世雄学英语第四册

EXPLORATIONS - The History of the Laser Welcome to EXPLORATIONS in VOA Special English. Im Mario Ritter. This week, we tell about one of the most recognizable objects in science fiction the laser. It is one of the best examples of how technology can

发表于:2018-12-16 / 阅读(93) / 评论(0) 分类 2013年VOA慢速英语(二)月

This is Scientific American's 60-Second Science. I'm Steve Mirsky . Got a minute ? Athletes have obviously been tempted to use performance enhancing anabolic steroids. Drug testing may discourage such use. But a new study finds that some of the perfo

发表于:2018-12-24 / 阅读(107) / 评论(0) 分类 Scientific American(九)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(126) / 评论(0) 分类 Scientific American(九)月

Ben Franklin And A Very Furry Situation When they hear the name Ben Franklin, many folks think of the Declaration of Independence, the Continental Congress and things like that. Not as many people remember that Franklin was an inventor . . . and a go

发表于:2018-12-31 / 阅读(69) / 评论(0) 分类 英语听力文摘 English Digest

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(228) / 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(83) / 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(86) / 评论(0) 分类 TED演讲科技篇

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(154) / 评论(0) 分类 VOA慢速英语2008年(十二)月

STEVE EMBER: Im Steve Ember. FAITH LAPIDUS: And Im Faith Lapidus with EXPLORATIONS in VOA Special English. This week, we tell about one of the most recognizable objects in science fiction the laser. And we tell how the laser has made its mark in the

发表于:2019-01-12 / 阅读(93) / 评论(0) 分类 2010年VOA慢速英语(九)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(95) / 评论(0) 分类 TED演讲教育篇

Welcome to EXPLORATIONS in VOA Special English. Im Mario Ritter. This week, we tell about one of the most recognizable objects in science fiction the laser. It is one of the best examples of how technology can go from the science of the future to eve

发表于:2019-01-24 / 阅读(138) / 评论(0) 分类 英语语言学习

AGRICULTURE REPORT December 17, 2002 — Irradiated Meat This is the VOA Special English Agriculture Report. The United States government has approved methods of destroying bacteria in meat by using r

发表于:2019-01-30 / 阅读(108) / 评论(0) 分类 农业与发展

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(143) / 评论(0) 分类 People in America

PV solar technology is more complex. When sunlight hits a PV cell, electrons in the cell are knocked out of their orbits. Electric fields channel the electrons in a current used to generate electricity。 Unlike thermal solar panels, PV technology is

发表于:2019-02-15 / 阅读(77) / 评论(0) 分类 英语时差8,16

It was while puzzling over this problem that Bohr was struck by a solution and dashed off his famous paper. Called On the Constitutions of Atoms and Molecules, the paper explained how electrons could keep from falling into the nucleus by suggesting t

发表于:2019-02-17 / 阅读(70) / 评论(0) 分类 万物简史

Ya?l: Welcome to another episode of Lunch with Don and Ya?l. So, Don, what are you eating today? Don: Nothing. Y: Nothing!?! Are you on a diet or something? D: Not by choice. To be honest, I'm trying to save money by buying less food. Y: Why? D: Beca

发表于:2019-02-23 / 阅读(85) / 评论(0) 分类 英语时差8,16

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(134) / 评论(0) 分类 万物简史

如何有效提高托福听力? 重庆新东方童燕老师为大家带来全新的词块法提高托福听力水平。 我们换个角度来谈听力,不谈语音,不谈词汇,不谈技巧,从逻辑思维这一层来分析,在单词都能听

发表于:2019-03-11 / 阅读(144) / 评论(0) 分类 托福英语
学英语单词
abscissus
abu haswah
amharas
anal plexus
anti-corrosive paint (ac)
antimonous chloride
area excavation
assuredness
Bell core
belly flop
benzylhydroperoxide
bitwise operation
c language
carondelet
chamaecyparis
colo(u)r planning
computerized operation
conical bottom
constant inclination
dioxiranes
doctrinate
draconi
end-of-footage
expanding lattice clay
extreme unction
fibreglass reinforced bituminous felt
field velocity MHD generator
Flavians
forehand shot
Frankershausen
grain growth inhibition
ground cosmic ray
grundnorms
guttah
hairy shaker disease
horseiest
hydraulic maintenance panel
IJN
in store for
interscapulothoracic
kabylias
kidventure
lloyd's foreign legislation department
lovingkindness
macrophyllous
magnetoelectric transducer
mammal semnopithecuss
monarda
multiple fraction defective sampling
mummeite
muscicapa striatas
NO-914
number of radionuclides
o.s.m
online mode
oropharyngeal membrane
orris
phage typing
phenadone
piano wires
pityriasis streptogenes
plumptitude
post-khomeini
pot-kilp
pretious
prevailing wind direction
probatilistic choice
pseudochylous ascites
pushahs
real estate mortgage investment conduit
retained interest
root topper
rothchildren
rubber reservoir
Samburu National Reserve
shirozuella appendiculata
Short-term reserves
site address
steam pianos
steelheading
straight-edge bobbin
study phase identifier
substance of economic law
sugges
TFTR
the catwalk
thyrsi-
timber apron
tresortil
truncus costocervicalis
tuning fork watch
turnaround delay
two-out-of-three voting system
under the hand of
variation constant
vehicle running board
veterinary medicines
whole blood transfusion
william iiis
Yatay
zigzag kiln
zs