时间:2019-01-22 作者:英语课 分类:自然百科2011年


英语课

 If we could flip 1 a switch and just turn off the Earth's magnetic field, it will take about 15,000 years to disappear, based on the rate of decay of the field that we've seen over the last 150 years. It's currently decaying at a rate that would see and disappear in 1500 years.


 
Earth's magnetic field is decaying fast. Discovering the consequences for our planet, is a top priority. Earth's magnetic field is fading. But what would happen if it disappeared completely? The answer lies on another planet in the solar system.
 
In 1996, NASA launched the Mars Global Surveyor, its mission to unlock the red planet's secrets.
 
Of all the planets in the solar system, Mars is the most similar to Earth. Both planets are made from the same materials. They each have / hard crusts, dense 2 cores and relatively 3 similar atmospheric 4 chemistry. Scientists believe that as on Earth water flowed on Mars' surface, but that was billions of years ago. Today, the planet is a frozen desert. To find out why, the orbiting Mars Global Surveyor collects data from the red planet. Professor Ben Vice 5 uses this data to reconstruct its past.
 
Unlike the Earth, Mars' today does not have a global magnetic field generated in its core. But if you will walk around the ancient southern highlands of Mars, you'll be walking in many places and fields as strong as the Earth. But it is very complicated, almost like spaghetti, pointing, you know, in different directions, not pointing in North at all.
 

vt.快速翻动;轻抛;轻拍;n.轻抛;adj.轻浮的
  • I had a quick flip through the book and it looked very interesting.我很快翻阅了一下那本书,看来似乎很有趣。
  • Let's flip a coin to see who pays the bill.咱们来抛硬币决定谁付钱。
a.密集的,稠密的,浓密的;密度大的
  • The general ambushed his troops in the dense woods. 将军把部队埋伏在浓密的树林里。
  • The path was completely covered by the dense foliage. 小路被树叶厚厚地盖了一层。
adv.比较...地,相对地
  • The rabbit is a relatively recent introduction in Australia.兔子是相对较新引入澳大利亚的物种。
  • The operation was relatively painless.手术相对来说不痛。
adj.大气的,空气的;大气层的;大气所引起的
  • Sea surface temperatures and atmospheric circulation are strongly coupled.海洋表面温度与大气环流是密切相关的。
  • Clouds return radiant energy to the surface primarily via the atmospheric window.云主要通过大气窗区向地表辐射能量。
n.坏事;恶习;[pl.]台钳,老虎钳;adj.副的
  • He guarded himself against vice.他避免染上坏习惯。
  • They are sunk in the depth of vice.他们堕入了罪恶的深渊。
学英语单词
absorption reaction rate
abuse of law
acrobatic show
Aleksandrinka
Allo-PBSCT
application workspace
arbitrally
blinking method of stereoscopic viewing
brass watch case blank
Chilean tinamous
cixiid
clap-hand
common laburnum
compartment hot well
compartmentalised
conductivity
contra-cyclical measures
Coquimbo owl
cross platform
cyclotheric sedimentation
dc data set
determinable freeholds
diacetylurea
dicumarols
elasto-aerodynamics
erosional vacuity
erotematic
final thermomechanicaltreatment
Gamu
general most favoured nation clause
glory of the snow
green goodss
gyroso-
hally
haylee
hofners
hydrated stock
hyperthite
idiologism
in the jug
incidental cost
ioduretted
items sample
keep on trucking
kindjals
koevoets
laminated clay
Lasianthus formosensis
leveling off
macro-observation
magmatic circulation
marine windscreen
mGal, mgal
moisture measurer for sand and stone
muscle scars
N.C.
nbcc
nobeliums
nuclenoic
NuLab
on-state characteristic
peritoneal tap
phthioic acid
plate mangle
prends
prevention of collision
prolmon tablet
pyramidal cells
raw mast
reactor coolant system cold leg isolation valve
Regranex
relative-entropy
reliability index of generating system
risto
Rubus chiliadenus
sit down to
solti
standard reference materials
starch ester
static stability margin
stochastic procss
strict secrecy
stupiditarian
superior characters
switching pulse
symbiotic action
synedra undulata
synthetic nitrogenous fertilizer
systematic production of substitution lines
thuggish
total corneal transplantation
total variation decreasing scheme
Tuamarina
twin-screw conveyor
TWTA
ultraviolet radiations
unintentional nonlinearity
unquietous
wassily chair
wax string
y.m