时间:2019-01-23 作者:英语课 分类:探索与发现2014年


英语课

 Comparing the effects of an airburst with a ground strike, it seems the Chelyabinsk got away lightly. It’s estimated that the largest piece to hit the ground weighed 500 kilos, a fraction of the asteroid’s original mass of 7,000 tonnes. 


 
Now if a piece of rock that big had hit that area of Russia, it would have produced a huge impact crater 1. Then that kinetic 2 energy is then delivered into the ground and we see things like seismic 3 shock. So, you get … people would feel earthquakes on the ground.
 
So the fact that it was an airburst actually limited the consequences for the people on the ground. So, yes, still quite dramatic, still, you know, obviously, causing injuries. But it could have been a lot worse, had it survived down to ground.
 
Ground strikes are amongst the most destructive natural hazards we know of. When viewed from space, Earth’s encounters with giant asteroids 4 in its deep history are revealed. And there is evidence from our planet’s past of a truly devastating 5 meteorite 6 strike that decisively altered the course of life on Earth.   
 
Today millions of years after the impact, the evidence for that crater is well hidden. This is a gateway 7 to the cenotes, the unique cave system of Mexico’s Yucatan Peninsula.

n.火山口,弹坑
  • With a telescope you can see the huge crater of Ve-suvius.用望远镜你能看到巨大的维苏威火山口。
  • They came to the lip of a dead crater.他们来到了一个死火山口。
adj.运动的;动力学的
  • There exist many sources of energy both potential and kinetic.存在着许多势能和动能的能源。
  • The kinetic theory of gases is the best known example.气体动力学理论就是最有名的例子。
a.地震的,地震强度的
  • Earthquakes produce two types of seismic waves.地震产生两种地震波。
  • The latest seismic activity was also felt in northern Kenya.肯尼亚北部也感觉到了最近的地震活动。
n.小行星( asteroid的名词复数 );海盘车,海星
  • Asteroids,also known as "minor planets",are numerous in the outer space. 小行星,亦称为“小型行星”,在外太空中不计其数。
  • Most stars probably have their quota of planets, meteorids, comets, and asteroids. 多数恒星也许还拥有若干行星、流星、彗星和小行星。
adj.毁灭性的,令人震惊的,强有力的
  • It is the most devastating storm in 20 years.这是20年来破坏性最大的风暴。
  • Affairs do have a devastating effect on marriages.婚外情确实会对婚姻造成毁灭性的影响。
n.陨石;流星
  • The meteorite in Jilin Exhibition Hall is believed to be the largest in the world.吉林展览馆的陨石被认为是世界上最大的。
  • The famous Murchison meteorite smashed into the Australian ground in 1969.1969年著名的默奇森陨石轰然坠落在澳大利亚。
n.大门口,出入口,途径,方法
  • Hard work is the gateway to success.努力工作是通往成功之路。
  • A man collected tolls at the gateway.一个人在大门口收通行费。
学英语单词
Aldeia da Ponte
alligator tree
alukalin
Amygalopathy
aneroid flowmeter
Anseongcheon
ar rastan
area inertia moment
atrichous
bilateralness
black-shortness
bretange
budget message
carry at
chakravarthy
Chebyshev-Gauss quadrature
cheese-making
chrome-nickel molybdenum steel
closed agitator
comes clean
comparium
concurrent computing
cosmic X-ray astronomy
crabwalks
cyberchondriac
demung
depth-first search
displacement curve displacement leangth ratio
distribution-free method
dominant market player
double plane clutch
duct lining
erroneous belief
fast wave
Faure storage battery
flexible stranded wire
foam sponge indentation tester
fueler, fueller
Gelendzhik
gen m
glacification
gosesomere
goulet
haggiss
heavy back
high speed scrubber
Home I.
hub-and-spoke
immediate access storage
inner sanctum
insisteth
jaish-e-muhammads
jonsons
karneol (carnelian)
keybang
l'existence
lami
length of operation
magnetic selector
mean lunar semi-diurnal
mis-steps
Miscel.
misentreat
Ninh Phuoc
onjunes
out-scruze
package printing industry
phalangeals
pilot heading
poetaricine
printing concerns
propeller cap
Puccinia graminis
pulse height discriminator
Quita Sueňo Bk.
rah
reaffund
recovered solvent
reliability of satellite in orbit test
repoed
right quantity
Sapo, Sa.del
second secretary
servingprotein
settle out time
skeletal growth
spacecraft structural strength
spatial structure
specially moulded brick
stijls
Suidae
table tenniss
tectrice
three-colour colorimetry
time-consumer
transamidinase
Triotrast
Umm Sumaymah
unpopulous
unyement
watercraft oil-contaminated water treatment
wearproof alloy