表面有效度

MICHEL MARTIN, HOST: Mars is about to get a new visitor from Earth tomorrow. If all goes well, a NASA probe called InSight will land near the Martian equator. Its mission is to study the interior of the planet. But, before it can carry out its missio

发表于:2018-12-18 / 阅读(127) / 评论(0) 分类 2018年NPR美国国家公共电台11月

Create Your Own Moon Craters! What makes science really fun is when you get to do things yourself, so today were going to be making moon craters. Theyre the roundish blast-marks left on the moons surface by ancient meteorites. The moons surface is co

发表于:2018-12-31 / 阅读(75) / 评论(0) 分类 英语听力文摘 English Digest

Even as adults we still enjoy blowing bubbles, dont we? If youve ever wondered why blowing on a thin film of soapy water creates bubbles, this is your lucky day. All liquids have a property called surface tension. Take water, for example. Water molec

发表于:2018-12-31 / 阅读(102) / 评论(0) 分类 英语听力文摘 English Digest

High Inflation Fairs, carnivals, festivals or anywhere you can buy helium-filled balloons, youre sure to see at least one balloon rising into the sky after someone accidentally lets it go off. What happens to the balloon after it rises out of sight?

发表于:2018-12-31 / 阅读(94) / 评论(0) 分类 英语听力文摘 English Digest

How Rocks Appear In Your Garden I wonder how many of us went out this past spring to get our gardens ready for planting, smug in the thought that last year we got rid of all the rocks. Theres that nice big mound of them in the corner of the garden wh

发表于:2018-12-31 / 阅读(95) / 评论(0) 分类 英语听力文摘 English Digest

What Makes Windshield Glass So Tough? We tend to think of glass as fragilebut in fact, glass is pretty strong stuff. A flawless fiber of glass pulled lengthwise is five times stronger than steel! Although glass is quite strong, its also very brittlea

发表于:2018-12-31 / 阅读(96) / 评论(0) 分类 英语听力文摘 English Digest

地道美语听力播客English as a Second Language Podcast (ESLPod),是一家位于美国加州洛杉矶的英语教育研究机构推出的英文听力会话,于2005年7月23日首播, 主播Dr. Jeff McQuillan为南加州大学的语言学博士

发表于:2019-01-01 / 阅读(140) / 评论(0) 分类 地道美语播客

Microneedles 微针疗法 Female: From flu vaccin es to tetanus booster s , injections are a must in modern medicine. But do they always have to make you say Ouch? Male: Eh,no? F: No,indeed.If new microneedle technology is successful, we may soon hav

发表于:2019-01-26 / 阅读(104) / 评论(0) 分类 英语听力文摘 English Digest

地球是太阳系从内到外的第三颗行星,也是太阳系中直径、质量和密度最大的类地行星。它也经常被称作世界。英语的地球Earth一词来自于古英语及日耳曼语。地球已有44~46亿岁,有一颗天然

发表于:2019-01-26 / 阅读(108) / 评论(0) 分类 英语听力文摘 English Digest

A Smooth Wake 平静的尾流 (A smooth wake on today's moments of science) Female: Donne and I are on a fantacy cruise . The sun has set and were standing on the rear deck. Look at the reflection of the moon. Male: You might expect a ship's wake

发表于:2019-01-26 / 阅读(84) / 评论(0) 分类 英语听力文摘 English Digest

The National Oceanic and Atmospheric Administration (NOAA) confirms that some of the oil escaping from that ruptured well in the Gulf of Mexico is staying beneath the surface, raising new environmental concerns about the disaster. BP says there is no

发表于:2019-01-30 / 阅读(144) / 评论(0) 分类 VOA标准英语2010年(六)月

Climate change negotiators from 173 countries have agreed on an agenda after days of bickering over the scope of talks left little time for substantive discussions. The disagreement highlighted deep divisions between developing and rich countries on

发表于:2019-01-30 / 阅读(147) / 评论(0) 分类 英语新闻

Marit Larsen 从那个红遍全球的少女组合M2M里走出来的Marit Larsen并没延续M2M的流行摇滚,而是选择了清澈的民谣曲风,用她时而俏皮时而的甜蜜的嗓音来吟唱她自己写的小曲儿,带给听者如沐春风的清新感觉。 中英歌词: It's such a funny sensation to be so happy that

发表于:2019-02-06 / 阅读(163) / 评论(0) 分类 音乐咖啡厅

Hi there, I'm Ore with the BBC World News for Children. Coming up: Japan's mission to super hot planet. A new survey says kids care more about computers than animals. And Inter Milan face Bayern Munich in the Champion's League final. First up, after

发表于:2019-02-16 / 阅读(104) / 评论(0) 分类 英语听力文摘 English Digest

LOS ANGELES, June 18 (Xinhua) -- Microsoft Corp. unveiled Monday a family of tablets dubbed Surface, built on Windows 8, at an event in Los Angeles. Microsoft Chief Executive Steve Ballmer introduced the company's Surface family of tablets. The devic

发表于:2019-02-17 / 阅读(139) / 评论(0) 分类 英语新闻

The director of the U.S. Secret Service says his agency was responsible for allowing an unauthorized couple to attend a White House state dinner last week. Chris Simkins | Washington 04 December 2009 MIchaele and Tareg Salahi, greet President Barack

发表于:2019-02-19 / 阅读(148) / 评论(0) 分类 VOA标准英语2009年(十二月)

Why lips go dry? 为什么嘴唇会干呢? Lets start by reviewing the ways in which the surface of our lips is different from the surface of the skin on the rest of our bodies. Basically, our lips are made of the same mucus membrane that coats t

发表于:2019-02-24 / 阅读(122) / 评论(0) 分类 英语听力文摘 English Digest

It's a common enough sound in summer, after the wind finally picks up on a hot and humid afternoon, as the rain starts spattering down in big, fat drops--you're in for a full-blown thunderstorm. It's much less common in winter, even during a snow sto

发表于:2019-02-24 / 阅读(154) / 评论(0) 分类 英语听力文摘 English Digest

Topics: Ask an American: social media and job searches; go ahead, make my day; years old versus year old Words: to scratch the surface theres no telling wild, wild west tremendous social media to enhance credibility thought leadership buddy to dictat

发表于:2019-03-05 / 阅读(250) / 评论(0) 分类 美语听力 English Cafe

Why Frisbees Fly With a gentle flick of the wrist on a warm summer day, you can launch a frisbee on a long and graceful flight. Why do they fly so well? One reason is something called gyroscopic force. This is the tendency of a spinning object to mai

发表于:2019-03-09 / 阅读(157) / 评论(0) 分类 英语听力文摘 English Digest
学英语单词
a sense of purpose
Abbe autocollimation measuring
acid rebound
allestrees
Amrabad
answerless
apron washer
au-rich
bagasse board
basic cadmium chloride
be rose s all the way
best beat method
bluejays
boat fall block
bridge to bridge radio telephone
cargo tonnage handled
Catatropis
cathodic stripping
central excitation
chamber musics
Chia-Fan wine
Christiaan Huygens
cocolonization
comanagement
connectionless Network Protocal
conversion of viscosity
cradle snatch
cross-action
cross-drum boiler
crystalliferous cell
Dhalgaon
diorate
dispenser
disproportionable
drag-over unit
dual-automaton
dynamic balancing tester
eight-hit
elementary particle spectroscopy
engine engine sump
equal angle cutter
equivalent sequences
fanned out
FE-5
final settlement run
fixedtype metal-clad switchgear
fold line
four-limbed
friction pawl
goldfish-bowls
graph notation for AND/OR graphs
guard mount
gum pot
hinge bracket bolt
ho-ax
implicit address
inborn errors of metabolism
Jerichos
juniper oil
kosgei
Köln, Regierungsbezirk
limit by row
manganous benzoate
matsuya
Mała Ina
MEB disease
mesoscale convective (cloud) cluster
metopagus
mezza voce
multiple-wave interference
nitrated cloth
non-blacks
outright rate of exchange
outroom
overexpressed
physical inventory entry
positizable
potassium-calcium age method
preferred ordinary shares
probability method
processing item
purchasing hedge
pure car and truck carrier
raise money
re-draws
Redonda, R.
residual nitrogen
routheroock
sectional mold
see above
Shire River
shock line
similarity criterion
sliding stop
social login
supradural
temperature-compensated thermist current meter
Tezu
tube bending machine
turfiness
upstroke press
veterinary college