水银断续器

The Mercury Mess By Samantha Levine / 2004, as first appeared in U.S. News nbsp; What are the dangers of mercury in fish? Can the mercury mess be cleaned up? 1 Are these fish safe to eat?” It’s a

发表于:2018-12-19 / 阅读(83) / 评论(0) 分类 彭蒙惠英语

Mercury Fillings Seem Safer over Time A study in the journal Chemical Research in Toxicology finds that mercury on the surface of dental fillings slowly turns to an inert sulfide compound, which should keep the mercury from harming the nervous system

发表于:2019-01-02 / 阅读(146) / 评论(0) 分类 60秒科学

HEALTH REPORT – December 11, 2002: Mercury Levels in Fish By George Grow This is the VOA Special English Health Report. Two studies are adding to the debate about the health risks of eating fish con

发表于:2019-01-07 / 阅读(67) / 评论(0) 分类 健康与环境

Craters here stretch as far as the eye can see. Although no human has ever set foot on Mercury, we have a pretty good idea of what you would see. If you are walking around on the surface of Mercury, it will look outwardly a lot like the moon. When yo

发表于:2019-02-05 / 阅读(64) / 评论(0) 分类 自然百科2012年

Many aspects, like its geological past, are a mystery. But some things we do know, this lonely planet has a strange sense of keeping time. Once you arrive, you have to reset your watch for a time zone like no other. It has such an unusual orbit and r

发表于:2019-02-05 / 阅读(60) / 评论(0) 分类 自然百科2012年

Mercury's core makes up about 60% of the planet by mass. It's about twice as big as earth. Why would it have such a huge core for such a small planet? Some people think there was a huge impact. Kind of stripped off a lot of the planet and now what we

发表于:2019-02-05 / 阅读(64) / 评论(0) 分类 自然百科2012年

After Messenger's 3 fly-bys, we've now mapped more than 90% of the planet. Taken from around 124 miles, these images are the clearest to date of Mercury. And it's not hard to spot a crater of epic proportions, the result of yet another Titanic collis

发表于:2019-02-05 / 阅读(75) / 评论(0) 分类 自然百科2012年

Reason/ you are going to go to Mercury as a travel destination would be this night sight view because it's going to be highly unique in the solar system. You have sodium thats atoms that are streaming off and giving enough to see yellow light, so you

发表于:2019-02-05 / 阅读(71) / 评论(0) 分类 自然百科2012年

Move away from the sun, and you'd expect things to cool down a little. Venus, the picture of coolness and calm, all pale but gully-cloaked by clouds but the planet of love is shrouded in mystery-----------draw beneath her treacherous veil at your own

发表于:2019-02-05 / 阅读(75) / 评论(0) 分类 自然百科2012年

You are there, on the most exciting, nerve-shattering journey in the history of man! Fifty years ago, it was easy for us to imagine Venus, closer to the Sun and wrapped in clouds, to be our scorched, tropical sister, swarming with life. There was thi

发表于:2019-02-05 / 阅读(80) / 评论(0) 分类 自然百科2012年

And thats the first time; it was return black-and-white panoramas of the Venus surface. These images were extremely important, because it was the first time, we ,human beings had a chance to see with our naked eyes completely different other world. W

发表于:2019-02-05 / 阅读(67) / 评论(0) 分类 自然百科2012年

In 1989, the space shuttle Atlantis launches the Magellan Probe toward / Venus. After a journey of 15 months, Magellan uses radar eyes to peer through the clouds from orbit. Watching form earth is Ellen Stofan. When you have that ability to pick up a

发表于:2019-02-05 / 阅读(72) / 评论(0) 分类 自然百科2012年

And its here in a freezer that Messenger will encounter another puzzle: can ice exist on a planet so close to the sun? It's only when the first radar observations to the surface of Mercury were obtained back in the 90s that it was discovered that Mer

发表于:2019-02-05 / 阅读(124) / 评论(0) 分类 自然百科2012年

By Paul Sisco Washington, DC 15 February 2008 Scientists have started analyzing data and images acquired when the Messenger space probe passed within 200 kilometers of the planet Mercury last month. It was the first flyby of the solar system's inner-

发表于:2019-02-06 / 阅读(133) / 评论(0) 分类 VOA常速英语2008年(二月)

On earth, Hawaii has some of the most spectacular shield volcanoes that are very similar with the volcanoes we see on Venus. The huge gently sloped volcanoes of Hawaii may be impressive. On Venus there are at least 150 ranging from this size to ten t

发表于:2019-02-15 / 阅读(107) / 评论(0) 分类 自然百科2012年

One of the really exciting and high-level scientific interests is whether Venus is geological active today, because there are reasons to think of the clouds on Venus only exist, because there is ongoing geological activity, so this is one of the bigg

发表于:2019-02-15 / 阅读(115) / 评论(0) 分类 自然百科2012年

Congratulations, you've arrived on the hottest surface in the solar system. Here, the official temperature is eight hundred seventy degrees Fahrenheit. Day or night, equator or pole, the searing heat never varies more than a few degrees, and thats wh

发表于:2019-02-15 / 阅读(132) / 评论(0) 分类 自然百科2012年

Despite all this scientific effort, we still don't know what triggered Venus' diabolical transformation. People debated over whether Venus ever had a moon. If Venus had a satellite at one point, could that satellite eventually impacted onto the surfa

发表于:2019-02-15 / 阅读(116) / 评论(0) 分类 自然百科2012年

Valor will be tackling the acid clouds of Venus with little help from flying pan technology. This being two weather balloons are we watched Venus in the mid-1980s. This with wagon machines there were two sep balloons that the Russians put them in the

发表于:2019-02-15 / 阅读(114) / 评论(0) 分类 自然百科2012年

You never guess the dangers on the ground from orbit, except maybe for this, massive, double-barreled storms hovering above the poles. Of this, what we called dipole features trailing around, we don't know what, really what they are, but the whole fe

发表于:2019-02-15 / 阅读(131) / 评论(0) 分类 自然百科2012年
学英语单词
aequorins
alignment time
alternative quarantine anchorage
arcus venosus plantaris
array controller
arundinacea
ash free
ayguous
Bavistin
bicharacteristic curve
bleeders' disease
bunnier
caguan
calmecacs
canoeings
chernozem soil
choy root
conservation plant
core strainer
counteroperation
cretaceous transformation
d-corydine
do me a favor
doomeds
electric central warm-air furnace
electronic comparator
embryo-nourishing
emolument
end-tighting blading
Epistle of Jude
fire companies
fragrant flower
freight of combined transport
goods-delivered summary
Great Bear L.
gym mats
ideal of Lie algebra
Illigera grandiflora
in the hat
induction shielding
Italophilia
jamb on door or window
kinship groups
kluxers
kohua
lead naphthenate
Lūnāvāda
magnetic order
mammary ductography
metacomments
mixed sea and land risk
monosexuals
mucke
Myitta
myosthenomete
natural differentiation
negode
nocera
Nuqrah
pair of stereoscopic pictures,stereopair
phonemicizations
phoradendron flavescenss
picrotoxinism
plantar warts
postrevascularization
progressive culture
quidnuncery
ralph ellisons
remi infrapatellaris
residual stability range
return of duties
revishing
ringo starrs
RTT
sandwich blending
sealed against
section locking
seed pod
simultaneous access
soda
sound signal digital
statistical language
straight-bar rib machine
stuermer
styrax suberifolia
suit one's actions to the words
surface plant
tared
teeth-roll crusher
terrain exercise
thermistor material
thingified
three-plier
total variation diminishing
transparency glass
trigonometer
unalloyed steel
vocal solo
Wassermann, August von
well-bakeds
with the wind
yawneth