预测界限

Conditions on Mars were so harsh that it was hard to imagine any life surviving there. The idea of sophisticated aliens was wiped out. We know that conditions on Mars today are not very good for life.

发表于:2018-12-07 / 阅读(93) / 评论(0) 分类 火星生命

These discoveries raised the stakes. Here was a planet similar to our own. Mars might not have cities or civilizations. But it could be home to other smaller life forms like microbes. Chris McKay is N

发表于:2018-12-07 / 阅读(123) / 评论(0) 分类 火星生命

I think it is exciting. Because it would imply that if life arose independently on Mars. The implication is that life is pervasive throughout the universe. This is why Mars has so obsessed scientists.

发表于:2018-12-07 / 阅读(93) / 评论(0) 分类 火星生命

In 2001 a new NASA probe was launched. Called Odyssey, it was sent to Mars to carry out the most detailed analysis ever of the planet’s surface. What it has discovered may be about to answer one of

发表于:2018-12-07 / 阅读(80) / 评论(0) 分类 火星生命

But even if there had been water, life doesn't start overnight. Even a simple microbe is the product of complex chemical systems that take millions of years to evolve. Had the water lasted long enough

发表于:2018-12-07 / 阅读(84) / 评论(0) 分类 火星生命

Rice had seen the same thing in Iceland, one of the few places on Earth with similarities to Mars. It too is extremely cold, and most of the water is frozen into glaciers. And also like Mars, buried u

发表于:2018-12-07 / 阅读(103) / 评论(0) 分类 火星生命

For Mars to have rivers, it must once have had streams, rain, clouds and an atmosphere, a planet just like the Earth today-if these were rivers. They had to be sure. The answers would come in 1998 wit

发表于:2018-12-07 / 阅读(112) / 评论(0) 分类 火星生命

William Boynton is professor of planetary sciences at the University of Arizona. And he's dedicated his life to looking for water on Mars. The link between life and water is very strong. Even here in

发表于:2018-12-07 / 阅读(110) / 评论(0) 分类 火星生命

'Deepwater Horizon' Honors The Sacrifice Without Sacrificing The Action play pause stop mute unmute max volume 00:0003:02repeat repeat off Update Required To play the media you will need to either update your browser to a recent version or update you

发表于:2018-12-18 / 阅读(76) / 评论(0) 分类 2016年NPR美国国家公共电台10月

Transcript: News reporter: Here is the weather. Weather reporter: Welcome to the weather forecast. Now, lets see what the weather is like today. In the north of the country its very windy and cold. There is a chance of some rain too, so dont leave ho

发表于:2018-12-28 / 阅读(166) / 评论(0) 分类 一起闲话英语-English Chitchat

Of course, any terraforming is still a long way off. The next few expeditions to Mars will definitely be made by machines. NASA, are sending 2 rovers, capable of travelling over 100 meters a day in se

发表于:2019-01-02 / 阅读(98) / 评论(0) 分类 火星生命

Well, hearing that Odyssey had found subsurface water on Mars was enormously exciting for somebody who is involved in planning to send humans to Mars. Water has a number of important uses for us. At t

发表于:2019-01-02 / 阅读(119) / 评论(0) 分类 火星生命

Life on Earth is basically proteins and DNA, so we can wonder if there is life on Mars will also be DNA and proteins, the same type of DNA, the same type of proteins. One might think that DNA is such

发表于:2019-01-02 / 阅读(109) / 评论(0) 分类 火星生命

But there was something even better. Odyssey may not just have found ice. There may also be liquid water, and that means, there could be living creatures there too. Right now, there might be liquid wa

发表于:2019-01-02 / 阅读(126) / 评论(0) 分类 火星生命

But they never got there. The first disappeared into deep space. Another missed its target when its coordinates were confused. One NASA control center was working in metric, the other in feet and inch

发表于:2019-01-02 / 阅读(130) / 评论(0) 分类 火星生命

The ground here is permafrost, a mixture of soil and ice frozen together. A group of Russian scientists have teamed up with NASA to drill down into it in search of microorganisms. It's work that's bee

发表于:2019-01-02 / 阅读(126) / 评论(0) 分类 火星生命

One of these wavelengths corresponds to hydrogen, another wavelength would be iron. Another wavelength would be oxygen. And so you go to the part of the spectrum you are interested in and you see you'

发表于:2019-01-02 / 阅读(114) / 评论(0) 分类 火星生命

RACHEL MARTIN, HOST: Eight years ago today, an explosion on the Deepwater Horizon drilling rig killed 11 people and led to a massive oil spill in the Gulf of Mexico. The accident prompted big changes in how the country regulates offshore drilling. No

发表于:2019-01-16 / 阅读(88) / 评论(0) 分类 2018年NPR美国国家公共电台4月

VIENNA, Jan. 17 (Xinhua) -- The Organization of Petroleum Exporting Countries (OPEC) (石油输出国家组织 )raised its forecast Monday for global oil-demand growth this year, encouraged by outlook of continued world economic recovery. In 2011

发表于:2019-02-08 / 阅读(327) / 评论(0) 分类 英语新闻

今天我们要学的词是forecast. Forecast is spelled f-o-r-e-c-a-s-t; forecast. Forecast是预测的意思,比如,weather forecast 就是天气预报。Five major global banks lowered India's growth forecast from 6.4% to 5.7% for the current

发表于:2019-02-18 / 阅读(93) / 评论(0) 分类 英语单词荟萃
学英语单词
9-Dehydrohecogenin
abbreviator
active biological film
albumenising
all-capital earning rate
anchos
aneurysmograph
Aracatu
bet guvrin
brogued
bruceantarin
bull ropes
caissonset
canadian radio broadcasting commission
chrysanilines
Chrysanthemum indicum Linn.
Clare Corner
common converter
composite life
computing languages
corpora versicolorata
development fund
diesel scavenging air
edsel
eriobotrya prinoides rehd. et wils.
expressivists
fusuline
gaffneys
generalized continuum mechanics
Giong Chua
goal review interval
gush over
gyration surface
hand flag
heat-retaining capacity
henrici
hepatogenous pigment
i.l.i.
incensories
inland bill of lading clause
inspection shaft
iron monosulfide
isoniazid methanesulfonic sodium
know enough to come get out of the rain
Koupé, Mt.
Lunda Sul, Prov.da
Maesa membranacea
maximum-likelihood stochastic language
metal graphite bearing
mink coat
mold mould
movie extra
mycoplasma-like
naissance
non-automatic block section
notionalities
outsoaring
P-Hydroxyampicillin
paediatric psychopharmacology
peak run-off year
pecudiculture
phonon traveling wave amplifier
plead the baby act
pluralist democracy
Plélan-le-Petit
pneumatic gun nailer
printed symbols
ramteks
recent hail
ring systems
Rochore R.
rub shoulders with someone
San Felipe de Puerto Plata
sanh
Scutellaria barbata
sealing compound
softing point
spin driers
sprunt up
stagecoachmen
stoichiometric flame
striae malleolaris membranae tympani
Strumazol
stud book
supertensio
supplement angle
swallowin'
sycee
trichopterigia kishidai
tumlin
two-winged insects
unjudged
valve ring
video photographer
videofilms
virtual monitor
WCCS
wedge-shaped fracture
Western Harbour Crossing
wheel configuration
zunian